31673639617 has 2 divisors, whose sum is σ = 31673639618. Its totient is φ = 31673639616.

The previous prime is 31673639611. The next prime is 31673639651. The reversal of 31673639617 is 71693637613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18626517441 + 13047122176 = 136479^2 + 114224^2 .

It is a cyclic number.

It is not a de Polignac number, because 31673639617 - 2³ = 31673639609 is a prime.

It is not a weakly prime, because it can be changed into another prime (31673639611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15836819808 + 15836819809.

It is an arithmetic number, because the mean of its divisors is an integer number (15836819809).

Almost surely, 2^31673639617 is an apocalyptic number.

It is an amenable number.

31673639617 is a deficient number, since it is larger than the sum of its proper divisors (1).

31673639617 is an equidigital number, since it uses as much as digits as its factorization.

31673639617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2571912, while the sum is 52.

The spelling of 31673639617 in words is "thirty-one billion, six hundred seventy-three million, six hundred thirty-nine thousand, six hundred seventeen".