51490530 has 96 divisors (see below), whose sum is σ = 164795904. Its totient is φ = 10862208.

The previous prime is 51490529. The next prime is 51490531. The reversal of 51490530 is 3509415.

51490530 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 (51490529) and next prime (51490531).

It is a junction number, because it is equal to n+sod(n) for n = 51490494 and 51490503.

It is not an unprimeable number, because it can be changed into a prime (51490531) 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, 5047 + ... + 11333.

It is an arithmetic number, because the mean of its divisors is an integer number (1716624).

Almost surely, 2^51490530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51490530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82397952).

51490530 is an abundant number, since it is smaller than the sum of its proper divisors (113305374).

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

51490530 is a wasteful number, since it uses less digits than its factorization.

51490530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6320 (or 6317 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 51490530 is about 7175.6902107045. The cubic root of 51490530 is about 372.0281369630.

Adding to 51490530 its reverse (3509415), we get a palindrome (54999945).

The spelling of 51490530 in words is "fifty-one million, four hundred ninety thousand, five hundred thirty".