521315385 has 32 divisors (see below), whose sum is σ = 859994112. Its totient is φ = 269464320.

The previous prime is 521315357. The next prime is 521315413. The reversal of 521315385 is 583513125.

It is an interprime number because it is at equal distance from previous prime (521315357) and next prime (521315413).

It is not a de Polignac number, because 521315385 - 2⁶ = 521315321 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152040 + ... + 155430.

It is an arithmetic number, because the mean of its divisors is an integer number (26874816).

Almost surely, 2^521315385 is an apocalyptic number.

It is an amenable number.

521315385 is a deficient number, since it is larger than the sum of its proper divisors (338678727).

521315385 is a wasteful number, since it uses less digits than its factorization.

521315385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3713.

The product of its digits is 18000, while the sum is 33.

The square root of 521315385 is about 22832.3320096744. The cubic root of 521315385 is about 804.8226323735.

The spelling of 521315385 in words is "five hundred twenty-one million, three hundred fifteen thousand, three hundred eighty-five".