312108688657 has 2 divisors, whose sum is σ = 312108688658. Its totient is φ = 312108688656.

The previous prime is 312108688621. The next prime is 312108688673. The reversal of 312108688657 is 756886801213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311284769041 + 823919616 = 557929^2 + 28704^2 .

It is a cyclic number.

It is not a de Polignac number, because 312108688657 - 2¹¹ = 312108686609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 312108688598 and 312108688607.

It is not a weakly prime, because it can be changed into another prime (312108688687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156054344328 + 156054344329.

It is an arithmetic number, because the mean of its divisors is an integer number (156054344329).

Almost surely, 2^312108688657 is an apocalyptic number.

It is an amenable number.

312108688657 is a deficient number, since it is larger than the sum of its proper divisors (1).

312108688657 is an equidigital number, since it uses as much as digits as its factorization.

312108688657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 312108688657 in words is "three hundred twelve billion, one hundred eight million, six hundred eighty-eight thousand, six hundred fifty-seven".