31368402217 has 2 divisors, whose sum is σ = 31368402218. Its totient is φ = 31368402216.

The previous prime is 31368402209. The next prime is 31368402229. The reversal of 31368402217 is 71220486313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28919043136 + 2449359081 = 170056^2 + 49491^2 .

It is a cyclic number.

It is not a de Polignac number, because 31368402217 - 2³ = 31368402209 is a prime.

It is not a weakly prime, because it can be changed into another prime (31368402277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15684201108 + 15684201109.

It is an arithmetic number, because the mean of its divisors is an integer number (15684201109).

Almost surely, 2^31368402217 is an apocalyptic number.

It is an amenable number.

31368402217 is a deficient number, since it is larger than the sum of its proper divisors (1).

31368402217 is an equidigital number, since it uses as much as digits as its factorization.

31368402217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 31368402217 in words is "thirty-one billion, three hundred sixty-eight million, four hundred two thousand, two hundred seventeen".