31002111989 has 2 divisors, whose sum is σ = 31002111990. Its totient is φ = 31002111988.

The previous prime is 31002111983. The next prime is 31002112021. The reversal of 31002111989 is 98911120013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25331268964 + 5670843025 = 159158^2 + 75305^2 .

It is an emirp because it is prime and its reverse (98911120013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31002111989 - 2⁸ = 31002111733 is a prime.

It is a super-2 number, since 2×31002111989² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31002111983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15501055994 + 15501055995.

It is an arithmetic number, because the mean of its divisors is an integer number (15501055995).

Almost surely, 2^31002111989 is an apocalyptic number.

It is an amenable number.

31002111989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31002111989 is an equidigital number, since it uses as much as digits as its factorization.

31002111989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 35.

The spelling of 31002111989 in words is "thirty-one billion, two million, one hundred eleven thousand, nine hundred eighty-nine".