51125025 has 24 divisors (see below), whose sum is σ = 96602944. Its totient is φ = 23371200.

The previous prime is 51125023. The next prime is 51125027. The reversal of 51125025 is 52052115.

It is an interprime number because it is at equal distance from previous prime (51125023) and next prime (51125027).

It is not a de Polignac number, because 51125025 - 2¹ = 51125023 is a prime.

It is a super-2 number, since 2×51125025² = 5227536362501250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51124992 and 51125010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51125023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48166 + ... + 49215.

Almost surely, 2^51125025 is an apocalyptic number.

It is an amenable number.

51125025 is a deficient number, since it is larger than the sum of its proper divisors (45477919).

51125025 is a wasteful number, since it uses less digits than its factorization.

51125025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97401 (or 97396 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51125025 is about 7150.1765712463. The cubic root of 51125025 is about 371.1457665182.

The spelling of 51125025 in words is "fifty-one million, one hundred twenty-five thousand, twenty-five".