521389037 has 16 divisors (see below), whose sum is σ = 574339248. Its totient is φ = 470346240.

The previous prime is 521389027. The next prime is 521389073. The reversal of 521389037 is 730983125.

It can be written as a sum of positive squares in 8 ways, for example, as 682276 + 520706761 = 826^2 + 22819^2 .

It is not a de Polignac number, because 521389037 - 2²⁰ = 520340461 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 (521389027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192263 + ... + 194955.

It is an arithmetic number, because the mean of its divisors is an integer number (35896203).

Almost surely, 2^521389037 is an apocalyptic number.

It is an amenable number.

521389037 is a deficient number, since it is larger than the sum of its proper divisors (52950211).

521389037 is a wasteful number, since it uses less digits than its factorization.

521389037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3040.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 521389037 is about 22833.9448409599. The cubic root of 521389037 is about 804.8605326586.

The spelling of 521389037 in words is "five hundred twenty-one million, three hundred eighty-nine thousand, thirty-seven".