51161550 has 96 divisors (see below), whose sum is σ = 140241024. Its totient is φ = 12240000.

The previous prime is 51161543. The next prime is 51161557. The reversal of 51161550 is 5516115.

51161550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51161543) and next prime (51161557).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51161550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51161557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 166497 + ... + 166803.

It is an arithmetic number, because the mean of its divisors is an integer number (1460844).

Almost surely, 2^51161550 is an apocalyptic number.

51161550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51161550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70120512).

51161550 is an abundant number, since it is smaller than the sum of its proper divisors (89079474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51161550 is a wasteful number, since it uses less digits than its factorization.

51161550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 51161550 is about 7152.7302479543. The cubic root of 51161550 is about 371.2341307595.

Adding to 51161550 its reverse (5516115), we get a palindrome (56677665).

It can be divided in two parts, 5116 and 1550, that added together give a palindrome (6666).

The spelling of 51161550 in words is "fifty-one million, one hundred sixty-one thousand, five hundred fifty".