51311025 has 18 divisors (see below), whose sum is σ = 91904150. Its totient is φ = 27365760.

The previous prime is 51311023. The next prime is 51311033. The reversal of 51311025 is 52011315.

It can be written as a sum of positive squares in 3 ways, for example, as 9437184 + 41873841 = 3072^2 + 6471^2 .

It is not a de Polignac number, because 51311025 - 2¹ = 51311023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51310989 and 51311007.

It is not an unprimeable number, because it can be changed into a prime (51311023) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 113800 + ... + 114249.

Almost surely, 2^51311025 is an apocalyptic number.

It is an amenable number.

51311025 is a deficient number, since it is larger than the sum of its proper divisors (40593125).

51311025 is a wasteful number, since it uses less digits than its factorization.

51311025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228065 (or 228057 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 51311025 is about 7163.1714344974. The cubic root of 51311025 is about 371.5953152079.

The spelling of 51311025 in words is "fifty-one million, three hundred eleven thousand, twenty-five".