521979031 has 4 divisors (see below), whose sum is σ = 596547472. Its totient is φ = 447410592.

The previous prime is 521978987. The next prime is 521979049. The reversal of 521979031 is 130979125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521979031 - 2⁷ = 521978903 is a prime.

It is a super-2 number, since 2×521979031² = 544924217607397922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521973031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37284210 + ... + 37284223.

It is an arithmetic number, because the mean of its divisors is an integer number (149136868).

Almost surely, 2^521979031 is an apocalyptic number.

521979031 is a deficient number, since it is larger than the sum of its proper divisors (74568441).

521979031 is an equidigital number, since it uses as much as digits as its factorization.

521979031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74568440.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 521979031 is about 22846.8604188847. The cubic root of 521979031 is about 805.1640065515.

The spelling of 521979031 in words is "five hundred twenty-one million, nine hundred seventy-nine thousand, thirty-one".