51156625 has 16 divisors (see below), whose sum is σ = 68756688. Its totient is φ = 37776000.

The previous prime is 51156571. The next prime is 51156629. The reversal of 51156625 is 52665115.

It can be written as a sum of positive squares in 8 ways, for example, as 39350529 + 11806096 = 6273^2 + 3436^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51156625 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51156629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14116 + ... + 17365.

It is an arithmetic number, because the mean of its divisors is an integer number (4297293).

Almost surely, 2^51156625 is an apocalyptic number.

It is an amenable number.

51156625 is a deficient number, since it is larger than the sum of its proper divisors (17600063).

51156625 is a wasteful number, since it uses less digits than its factorization.

51156625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31509 (or 31499 counting only the distinct ones).

The product of its digits is 9000, while the sum is 31.

The square root of 51156625 is about 7152.3859655363. The cubic root of 51156625 is about 371.2222182538. Note that the first 4 decimals are identical.

The spelling of 51156625 in words is "fifty-one million, one hundred fifty-six thousand, six hundred twenty-five".