51995925 has 54 divisors (see below), whose sum is σ = 97012578. Its totient is φ = 27643680.

The previous prime is 51995921. The next prime is 51995941. The reversal of 51995925 is 52959915.

51995925 is a `hidden beast` number, since 51 + 9 + 9 + 592 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 26244 + 51969681 = 162^2 + 7209^2 .

It is not a de Polignac number, because 51995925 - 2² = 51995921 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51995921) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 163867 + ... + 164183.

Almost surely, 2^51995925 is an apocalyptic number.

It is an amenable number.

51995925 is a deficient number, since it is larger than the sum of its proper divisors (45016653).

51995925 is an frugal number, since it uses more digits than its factorization.

51995925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 325 counting only the distinct ones).

The product of its digits is 182250, while the sum is 45.

The square root of 51995925 is about 7210.8199949798. The cubic root of 51995925 is about 373.2413654379.

The spelling of 51995925 in words is "fifty-one million, nine hundred ninety-five thousand, nine hundred twenty-five".