664000031 has 2 divisors, whose sum is σ = 664000032. Its totient is φ = 664000030.

The previous prime is 664000027. The next prime is 664000063. The reversal of 664000031 is 130000466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664000031 - 2² = 664000027 is a prime.

It is a super-2 number, since 2×664000031² = 881792082336001922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 663999967 and 664000012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664000021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332000015 + 332000016.

It is an arithmetic number, because the mean of its divisors is an integer number (332000016).

Almost surely, 2^664000031 is an apocalyptic number.

664000031 is a deficient number, since it is larger than the sum of its proper divisors (1).

664000031 is an equidigital number, since it uses as much as digits as its factorization.

664000031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 664000031 is about 25768.1980549669. The cubic root of 664000031 is about 872.4141478677.

Adding to 664000031 its reverse (130000466), we get a palindrome (794000497).

The spelling of 664000031 in words is "six hundred sixty-four million, thirty-one", and thus it is an aban number.