312788856360881 has 2 divisors, whose sum is σ = 312788856360882. Its totient is φ = 312788856360880.

The previous prime is 312788856360791. The next prime is 312788856360979. The reversal of 312788856360881 is 188063658887213.

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., 244303152040000 + 68485704320881 = 15630200^2 + 8275609^2 .

It is a cyclic number.

It is not a de Polignac number, because 312788856360881 - 2⁴² = 308390809849777 is a prime.

It is a super-2 number, since 2×312788856360881² (a number of 30 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 312788856360799 and 312788856360808.

It is not a weakly prime, because it can be changed into another prime (312788856320881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156394428180440 + 156394428180441.

It is an arithmetic number, because the mean of its divisors is an integer number (156394428180441).

Almost surely, 2^{312788856360881} is an apocalyptic number.

It is an amenable number.

312788856360881 is a deficient number, since it is larger than the sum of its proper divisors (1).

312788856360881 is an equidigital number, since it uses as much as digits as its factorization.

312788856360881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 743178240, while the sum is 74.

The spelling of 312788856360881 in words is "three hundred twelve trillion, seven hundred eighty-eight billion, eight hundred fifty-six million, three hundred sixty thousand, eight hundred eighty-one".