51401025 has 36 divisors (see below), whose sum is σ = 99152508. Its totient is φ = 25303680.

The previous prime is 51400991. The next prime is 51401027. The reversal of 51401025 is 52010415.

It can be written as a sum of positive squares in 6 ways, for example, as 2792241 + 48608784 = 1671^2 + 6972^2 .

It is not a de Polignac number, because 51401025 - 2⁷ = 51400897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51400989 and 51401007.

It is not an unprimeable number, because it can be changed into a prime (51401027) 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, 5862 + ... + 11711.

Almost surely, 2^51401025 is an apocalyptic number.

It is an amenable number.

51401025 is a deficient number, since it is larger than the sum of its proper divisors (47751483).

51401025 is a wasteful number, since it uses less digits than its factorization.

51401025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17602 (or 17594 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51401025 is about 7169.4508157878. The cubic root of 51401025 is about 371.8124488159.

The spelling of 51401025 in words is "fifty-one million, four hundred one thousand, twenty-five".