521863031 has 4 divisors (see below), whose sum is σ = 544552752. Its totient is φ = 499173312.

The previous prime is 521862983. The next prime is 521863073. The reversal of 521863031 is 130368125.

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 521863031 - 2⁶ = 521862967 is a prime.

It is a super-2 number, since 2×521863031² = 544682046249013922, 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 = 521862985 and 521863003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521863631) 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, 11344826 + ... + 11344871.

It is an arithmetic number, because the mean of its divisors is an integer number (136138188).

Almost surely, 2^521863031 is an apocalyptic number.

521863031 is a deficient number, since it is larger than the sum of its proper divisors (22689721).

521863031 is a wasteful number, since it uses less digits than its factorization.

521863031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22689720.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 521863031 is about 22844.3216358026. The cubic root of 521863031 is about 805.1043579585.

The spelling of 521863031 in words is "five hundred twenty-one million, eight hundred sixty-three thousand, thirty-one".