31013031689 has 2 divisors, whose sum is σ = 31013031690. Its totient is φ = 31013031688.

The previous prime is 31013031683. The next prime is 31013031691. The reversal of 31013031689 is 98613031013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20299125625 + 10713906064 = 142475^2 + 103508^2 .

It is a cyclic number.

It is not a de Polignac number, because 31013031689 - 2¹² = 31013027593 is a prime.

Together with 31013031691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31013031683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506515844 + 15506515845.

It is an arithmetic number, because the mean of its divisors is an integer number (15506515845).

Almost surely, 2^31013031689 is an apocalyptic number.

It is an amenable number.

31013031689 is a deficient number, since it is larger than the sum of its proper divisors (1).

31013031689 is an equidigital number, since it uses as much as digits as its factorization.

31013031689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The spelling of 31013031689 in words is "thirty-one billion, thirteen million, thirty-one thousand, six hundred eighty-nine".