521481925 has 12 divisors (see below), whose sum is σ = 647894916. Its totient is φ = 416374400.

The previous prime is 521481901. The next prime is 521481949. The reversal of 521481925 is 529184125.

It is an interprime number because it is at equal distance from previous prime (521481901) and next prime (521481949).

It can be written as a sum of positive squares in 6 ways, for example, as 5919489 + 515562436 = 2433^2 + 22706^2 .

It is a de Polignac number, because none of the positive numbers 2^k-521481925 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 6994 + ... + 33043.

It is an arithmetic number, because the mean of its divisors is an integer number (53991243).

Almost surely, 2^521481925 is an apocalyptic number.

It is an amenable number.

521481925 is a deficient number, since it is larger than the sum of its proper divisors (126412991).

521481925 is a wasteful number, since it uses less digits than its factorization.

521481925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40568 (or 40563 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The square root of 521481925 is about 22835.9787396993. The cubic root of 521481925 is about 804.9083264303.

The spelling of 521481925 in words is "five hundred twenty-one million, four hundred eighty-one thousand, nine hundred twenty-five".