51520625 has 40 divisors (see below), whose sum is σ = 73607688. Its totient is φ = 35712000.

The previous prime is 51520583. The next prime is 51520627. The reversal of 51520625 is 52602515.

It can be written as a sum of positive squares in 20 ways, for example, as 51165409 + 355216 = 7153^2 + 596^2 .

It is not a de Polignac number, because 51520625 - 2¹⁸ = 51258481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51520594 and 51520603.

It is not an unprimeable number, because it can be changed into a prime (51520627) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 137939 + ... + 138311.

Almost surely, 2^51520625 is an apocalyptic number.

It is an amenable number.

51520625 is a deficient number, since it is larger than the sum of its proper divisors (22087063).

51520625 is a wasteful number, since it uses less digits than its factorization.

51520625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 51520625 is about 7177.7869151989. The cubic root of 51520625 is about 372.1006034028.

The spelling of 51520625 in words is "fifty-one million, five hundred twenty thousand, six hundred twenty-five".