51540425 has 12 divisors (see below), whose sum is σ = 64959756. Its totient is φ = 40555200.

The previous prime is 51540421. The next prime is 51540439. The reversal of 51540425 is 52404515.

It can be written as a sum of positive squares in 6 ways, for example, as 11648569 + 39891856 = 3413^2 + 6316^2 .

It is not a de Polignac number, because 51540425 - 2² = 51540421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51540394 and 51540403.

It is not an unprimeable number, because it can be changed into a prime (51540421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15374 + ... + 18423.

It is an arithmetic number, because the mean of its divisors is an integer number (5413313).

Almost surely, 2^51540425 is an apocalyptic number.

It is an amenable number.

51540425 is a deficient number, since it is larger than the sum of its proper divisors (13419331).

51540425 is a wasteful number, since it uses less digits than its factorization.

51540425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33868 (or 33863 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 51540425 is about 7179.1660379183. The cubic root of 51540425 is about 372.1482648868.

The spelling of 51540425 in words is "fifty-one million, five hundred forty thousand, four hundred twenty-five".