521591053 has 8 divisors (see below), whose sum is σ = 543074616. Its totient is φ = 500524800.

The previous prime is 521591023. The next prime is 521591069. The reversal of 521591053 is 350195125.

It can be written as a sum of positive squares in 4 ways, for example, as 30614089 + 490976964 = 5533^2 + 22158^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521591053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521591023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101776 + ... + 106777.

It is an arithmetic number, because the mean of its divisors is an integer number (67884327).

Almost surely, 2^521591053 is an apocalyptic number.

It is an amenable number.

521591053 is a deficient number, since it is larger than the sum of its proper divisors (21483563).

521591053 is a wasteful number, since it uses less digits than its factorization.

521591053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208655.

The product of its (nonzero) digits is 6750, while the sum is 31.

The square root of 521591053 is about 22838.3680021143. The cubic root of 521591053 is about 804.9644689383.

The spelling of 521591053 in words is "five hundred twenty-one million, five hundred ninety-one thousand, fifty-three".