51554140 has 48 divisors (see below), whose sum is σ = 119478240. Its totient is φ = 18529280.

The previous prime is 51554131. The next prime is 51554161. The reversal of 51554140 is 4145515.

It is a happy number.

51554140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51554140² = 5315658702279200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18264 + ... + 20896.

It is an arithmetic number, because the mean of its divisors is an integer number (2489130).

Almost surely, 2^51554140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51554140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59739120).

51554140 is an abundant number, since it is smaller than the sum of its proper divisors (67924100).

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

51554140 is a wasteful number, since it uses less digits than its factorization.

51554140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2742 (or 2740 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 51554140 is about 7180.1211688940. The cubic root of 51554140 is about 372.1812717340.

Adding to 51554140 its reverse (4145515), we get a palindrome (55699655).

The spelling of 51554140 in words is "fifty-one million, five hundred fifty-four thousand, one hundred forty".