51257925 has 36 divisors (see below), whose sum is σ = 92198340. Its totient is φ = 27221760.

The previous prime is 51257917. The next prime is 51257929. The reversal of 51257925 is 52975215.

51257925 is a `hidden beast` number, since 512 + 57 + 92 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 1004004 + 50253921 = 1002^2 + 7089^2 .

It is not a de Polignac number, because 51257925 - 2³ = 51257917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51257925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51257929) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 91747 + ... + 92303.

It is an arithmetic number, because the mean of its divisors is an integer number (2561065).

Almost surely, 2^51257925 is an apocalyptic number.

It is an amenable number.

51257925 is a deficient number, since it is larger than the sum of its proper divisors (40940415).

51257925 is a wasteful number, since it uses less digits than its factorization.

51257925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982 (or 974 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 51257925 is about 7159.4640162515. The cubic root of 51257925 is about 371.4670872640.

The spelling of 51257925 in words is "fifty-one million, two hundred fifty-seven thousand, nine hundred twenty-five".