31013212011989 has 2 divisors, whose sum is σ = 31013212011990. Its totient is φ = 31013212011988.

The previous prime is 31013212011983. The next prime is 31013212012009. The reversal of 31013212011989 is 98911021231013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30178212640900 + 834999371089 = 5493470^2 + 913783^2 .

It is a cyclic number.

It is not a de Polignac number, because 31013212011989 - 2²⁸ = 31012943576533 is a prime.

It is a super-2 number, since 2×31013212011989² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31013212011983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506606005994 + 15506606005995.

It is an arithmetic number, because the mean of its divisors is an integer number (15506606005995).

Almost surely, 2^{31013212011989} is an apocalyptic number.

It is an amenable number.

31013212011989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31013212011989 is an equidigital number, since it uses as much as digits as its factorization.

31013212011989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The spelling of 31013212011989 in words is "thirty-one trillion, thirteen billion, two hundred twelve million, eleven thousand, nine hundred eighty-nine".