51515538 has 16 divisors (see below), whose sum is σ = 107510976. Its totient is φ = 16425200.

The previous prime is 51515533. The next prime is 51515539. The reversal of 51515538 is 83551515.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51515499 and 51515508.

It is not an unprimeable number, because it can be changed into a prime (51515533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186513 + ... + 186788.

It is an arithmetic number, because the mean of its divisors is an integer number (6719436).

Almost surely, 2^51515538 is an apocalyptic number.

51515538 is an abundant number, since it is smaller than the sum of its proper divisors (55995438).

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

51515538 is a wasteful number, since it uses less digits than its factorization.

51515538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373329.

The product of its digits is 15000, while the sum is 33.

The square root of 51515538 is about 7177.4325493173. The cubic root of 51515538 is about 372.0883562813.

The spelling of 51515538 in words is "fifty-one million, five hundred fifteen thousand, five hundred thirty-eight".