31308918019 has 2 divisors, whose sum is σ = 31308918020. Its totient is φ = 31308918018.

The previous prime is 31308918013. The next prime is 31308918041. The reversal of 31308918019 is 91081980313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31308918019 - 2⁷ = 31308917891 is a prime.

It is a super-2 number, since 2×31308918019² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31308918013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15654459009 + 15654459010.

It is an arithmetic number, because the mean of its divisors is an integer number (15654459010).

Almost surely, 2^31308918019 is an apocalyptic number.

31308918019 is a deficient number, since it is larger than the sum of its proper divisors (1).

31308918019 is an equidigital number, since it uses as much as digits as its factorization.

31308918019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 43.

The spelling of 31308918019 in words is "thirty-one billion, three hundred eight million, nine hundred eighteen thousand, nineteen".