31313301989 has 2 divisors, whose sum is σ = 31313301990. Its totient is φ = 31313301988.

The previous prime is 31313301977. The next prime is 31313302003. The reversal of 31313301989 is 98910331313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29166833089 + 2146468900 = 170783^2 + 46330^2 .

It is an emirp because it is prime and its reverse (98910331313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31313301989 - 2²⁸ = 31044866533 is a prime.

It is a super-2 number, since 2×31313301989² (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 (31313351989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656650994 + 15656650995.

It is an arithmetic number, because the mean of its divisors is an integer number (15656650995).

Almost surely, 2^31313301989 is an apocalyptic number.

It is an amenable number.

31313301989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31313301989 is an equidigital number, since it uses as much as digits as its factorization.

31313301989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 41.

The spelling of 31313301989 in words is "thirty-one billion, three hundred thirteen million, three hundred one thousand, nine hundred eighty-nine".