316138886681 has 2 divisors, whose sum is σ = 316138886682. Its totient is φ = 316138886680.

The previous prime is 316138886671. The next prime is 316138886741. The reversal of 316138886681 is 186688831613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224638081600 + 91500805081 = 473960^2 + 302491^2 .

It is an emirp because it is prime and its reverse (186688831613) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-316138886681 is a prime.

It is a super-2 number, since 2×316138886681² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 316138886681.

It is not a weakly prime, because it can be changed into another prime (316138886671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158069443340 + 158069443341.

It is an arithmetic number, because the mean of its divisors is an integer number (158069443341).

Almost surely, 2^316138886681 is an apocalyptic number.

It is an amenable number.

316138886681 is a deficient number, since it is larger than the sum of its proper divisors (1).

316138886681 is an equidigital number, since it uses as much as digits as its factorization.

316138886681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7962624, while the sum is 59.

The spelling of 316138886681 in words is "three hundred sixteen billion, one hundred thirty-eight million, eight hundred eighty-six thousand, six hundred eighty-one".