31344642631 has 2 divisors, whose sum is σ = 31344642632. Its totient is φ = 31344642630.

The previous prime is 31344642613. The next prime is 31344642671. The reversal of 31344642631 is 13624644313.

Together with previous prime (31344642613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31344642631 - 2⁵ = 31344642599 is a prime.

It is a super-2 number, since 2×31344642631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31344642671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15672321315 + 15672321316.

It is an arithmetic number, because the mean of its divisors is an integer number (15672321316).

Almost surely, 2^31344642631 is an apocalyptic number.

31344642631 is a deficient number, since it is larger than the sum of its proper divisors (1).

31344642631 is an equidigital number, since it uses as much as digits as its factorization.

31344642631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 37.

The spelling of 31344642631 in words is "thirty-one billion, three hundred forty-four million, six hundred forty-two thousand, six hundred thirty-one".