51515156 has 48 divisors (see below), whose sum is σ = 118325760. Its totient is φ = 19012320.

The previous prime is 51515129. The next prime is 51515159. The reversal of 51515156 is 65151515.

It is a happy number.

It is a super-2 number, since 2×51515156² = 5307622595408672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51515159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1451 + ... + 10253.

It is an arithmetic number, because the mean of its divisors is an integer number (2465120).

Almost surely, 2^51515156 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 51515156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59162880).

51515156 is an abundant number, since it is smaller than the sum of its proper divisors (66810604).

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

51515156 is a wasteful number, since it uses less digits than its factorization.

51515156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8844 (or 8842 counting only the distinct ones).

The product of its digits is 3750, while the sum is 29.

The square root of 51515156 is about 7177.4059380810. The cubic root of 51515156 is about 372.0874365710.

The spelling of 51515156 in words is "fifty-one million, five hundred fifteen thousand, one hundred fifty-six".