521279425 has 12 divisors (see below), whose sum is σ = 654176880. Its totient is φ = 411997520.

The previous prime is 521279417. The next prime is 521279431. The reversal of 521279425 is 524972125.

It is not a de Polignac number, because 521279425 - 2³ = 521279417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123535 + ... + 127684.

It is an arithmetic number, because the mean of its divisors is an integer number (54514740).

Almost surely, 2^521279425 is an apocalyptic number.

It is an amenable number.

521279425 is a deficient number, since it is larger than the sum of its proper divisors (132897455).

521279425 is a wasteful number, since it uses less digits than its factorization.

521279425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251312 (or 251307 counting only the distinct ones).

The product of its digits is 50400, while the sum is 37.

The square root of 521279425 is about 22831.5445163046. The cubic root of 521279425 is about 804.8041265654.

The spelling of 521279425 in words is "five hundred twenty-one million, two hundred seventy-nine thousand, four hundred twenty-five".