51508925 has 12 divisors (see below), whose sum is σ = 68784660. Its totient is φ = 38037120.

The previous prime is 51508909. The next prime is 51508957. The reversal of 51508925 is 52980515.

51508925 = 1395² + 1396² + ... + 1420².

It can be written as a sum of positive squares in 6 ways, for example, as 22629049 + 28879876 = 4757^2 + 5374^2 .

It is not a de Polignac number, because 51508925 - 2⁴ = 51508909 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78920 + ... + 79569.

It is an arithmetic number, because the mean of its divisors is an integer number (5732055).

Almost surely, 2^51508925 is an apocalyptic number.

It is an amenable number.

51508925 is a deficient number, since it is larger than the sum of its proper divisors (17275735).

51508925 is a wasteful number, since it uses less digits than its factorization.

51508925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158512 (or 158507 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 51508925 is about 7176.9718544801. The cubic root of 51508925 is about 372.0724340586.

The spelling of 51508925 in words is "fifty-one million, five hundred eight thousand, nine hundred twenty-five".