51520225 has 24 divisors (see below), whose sum is σ = 65888640. Its totient is φ = 39942720.

The previous prime is 51520219. The next prime is 51520247. The reversal of 51520225 is 52202515.

It is not a de Polignac number, because 51520225 - 2⁵ = 51520193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51520196 and 51520205.

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, 191391 + ... + 191659.

It is an arithmetic number, because the mean of its divisors is an integer number (2745360).

Almost surely, 2^51520225 is an apocalyptic number.

It is an amenable number.

51520225 is a deficient number, since it is larger than the sum of its proper divisors (14368415).

51520225 is a wasteful number, since it uses less digits than its factorization.

51520225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 51520225 is about 7177.7590514032. The cubic root of 51520225 is about 372.0996404188.

The spelling of 51520225 in words is "fifty-one million, five hundred twenty thousand, two hundred twenty-five".