315015336762781 has 2 divisors, whose sum is σ = 315015336762782. Its totient is φ = 315015336762780.

The previous prime is 315015336762779. The next prime is 315015336762809. The reversal of 315015336762781 is 187267633510513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195908562666756 + 119106774096025 = 13996734^2 + 10913605^2 .

It is a cyclic number.

It is not a de Polignac number, because 315015336762781 - 2¹ = 315015336762779 is a prime.

It is a super-2 number, since 2×315015336762781² (a number of 30 digits) contains 22 as substring.

Together with 315015336762779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315015336769781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157507668381390 + 157507668381391.

It is an arithmetic number, because the mean of its divisors is an integer number (157507668381391).

Almost surely, 2^{315015336762781} is an apocalyptic number.

It is an amenable number.

315015336762781 is a deficient number, since it is larger than the sum of its proper divisors (1).

315015336762781 is an equidigital number, since it uses as much as digits as its factorization.

315015336762781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19051200, while the sum is 58.

The spelling of 315015336762781 in words is "three hundred fifteen trillion, fifteen billion, three hundred thirty-six million, seven hundred sixty-two thousand, seven hundred eighty-one".