31218112880657 has 2 divisors, whose sum is σ = 31218112880658. Its totient is φ = 31218112880656.

The previous prime is 31218112880627. The next prime is 31218112880681. The reversal of 31218112880657 is 75608821181213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22538908170256 + 8679204710401 = 4747516^2 + 2946049^2 .

It is a cyclic number.

It is not a de Polignac number, because 31218112880657 - 2¹⁶ = 31218112815121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31218112880599 and 31218112880608.

It is not a weakly prime, because it can be changed into another prime (31218112880627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15609056440328 + 15609056440329.

It is an arithmetic number, because the mean of its divisors is an integer number (15609056440329).

Almost surely, 2^{31218112880657} is an apocalyptic number.

It is an amenable number.

31218112880657 is a deficient number, since it is larger than the sum of its proper divisors (1).

31218112880657 is an equidigital number, since it uses as much as digits as its factorization.

31218112880657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1290240, while the sum is 53.

The spelling of 31218112880657 in words is "thirty-one trillion, two hundred eighteen billion, one hundred twelve million, eight hundred eighty thousand, six hundred fifty-seven".