31712808989 has 2 divisors, whose sum is σ = 31712808990. Its totient is φ = 31712808988.

The previous prime is 31712808923. The next prime is 31712809021. The reversal of 31712808989 is 98980821713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23663668900 + 8049140089 = 153830^2 + 89717^2 .

It is an emirp because it is prime and its reverse (98980821713) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31712808989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31712808889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15856404494 + 15856404495.

It is an arithmetic number, because the mean of its divisors is an integer number (15856404495).

Almost surely, 2^31712808989 is an apocalyptic number.

It is an amenable number.

31712808989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31712808989 is an equidigital number, since it uses as much as digits as its factorization.

31712808989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 56.

The spelling of 31712808989 in words is "thirty-one billion, seven hundred twelve million, eight hundred eight thousand, nine hundred eighty-nine".