51513425 has 24 divisors (see below), whose sum is σ = 67730040. Its totient is φ = 38796800.

The previous prime is 51513391. The next prime is 51513433. The reversal of 51513425 is 52431515.

It can be written as a sum of positive squares in 12 ways, for example, as 28174864 + 23338561 = 5308^2 + 4831^2 .

It is not a de Polignac number, because 51513425 - 2¹⁴ = 51497041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51513394 and 51513403.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28859 + ... + 30591.

It is an arithmetic number, because the mean of its divisors is an integer number (2822085).

Almost surely, 2^51513425 is an apocalyptic number.

It is an amenable number.

51513425 is a deficient number, since it is larger than the sum of its proper divisors (16216615).

51513425 is a wasteful number, since it uses less digits than its factorization.

51513425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813 (or 1808 counting only the distinct ones).

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

The square root of 51513425 is about 7177.2853503257. The cubic root of 51513425 is about 372.0832689266.

The spelling of 51513425 in words is "fifty-one million, five hundred thirteen thousand, four hundred twenty-five".