51621425 has 6 divisors (see below), whose sum is σ = 64010598. Its totient is φ = 41297120.

The previous prime is 51621359. The next prime is 51621431. The reversal of 51621425 is 52412615.

51621425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 6355441 + 45265984 = 2521^2 + 6728^2 .

It is not a de Polignac number, because 51621425 - 2²⁴ = 34844209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51621394 and 51621403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1032404 + ... + 1032453.

It is an arithmetic number, because the mean of its divisors is an integer number (10668433).

Almost surely, 2^51621425 is an apocalyptic number.

It is an amenable number.

51621425 is a deficient number, since it is larger than the sum of its proper divisors (12389173).

51621425 is a wasteful number, since it uses less digits than its factorization.

51621425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064867 (or 2064862 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 51621425 is about 7184.8051469751. The cubic root of 51621425 is about 372.3431166753.

The spelling of 51621425 in words is "fifty-one million, six hundred twenty-one thousand, four hundred twenty-five".