521031 has 16 divisors (see below), whose sum is σ = 813824. Its totient is φ = 290304.

The previous prime is 521023. The next prime is 521039. The reversal of 521031 is 130125.

It is an interprime number because it is at equal distance from previous prime (521023) and next prime (521039).

It is not a de Polignac number, because 521031 - 2³ = 521023 is a prime.

It is a super-2 number, since 2×521031² = 542946605922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520998 and 521016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 615 + ... + 1191.

It is an arithmetic number, because the mean of its divisors is an integer number (50864).

2⁵²¹⁰³¹ is an apocalyptic number.

521031 is a deficient number, since it is larger than the sum of its proper divisors (292793).

521031 is a wasteful number, since it uses less digits than its factorization.

521031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 521031 is about 721.8247709798. The cubic root of 521031 is about 80.4676258334.

Adding to 521031 its reverse (130125), we get a palindrome (651156).

The spelling of 521031 in words is "five hundred twenty-one thousand, thirty-one".