315051056540581 has 2 divisors, whose sum is σ = 315051056540582. Its totient is φ = 315051056540580.

The previous prime is 315051056540483. The next prime is 315051056540593. The reversal of 315051056540581 is 185045650150513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 297567502521025 + 17483554019556 = 17250145^2 + 4181334^2 .

It is an emirp because it is prime and its reverse (185045650150513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315051056540581 - 2⁹ = 315051056540069 is a prime.

It is a super-2 number, since 2×315051056540581² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315051056510581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157525528270290 + 157525528270291.

It is an arithmetic number, because the mean of its divisors is an integer number (157525528270291).

Almost surely, 2^{315051056540581} is an apocalyptic number.

It is an amenable number.

315051056540581 is a deficient number, since it is larger than the sum of its proper divisors (1).

315051056540581 is an equidigital number, since it uses as much as digits as its factorization.

315051056540581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800000, while the sum is 49.

The spelling of 315051056540581 in words is "three hundred fifteen trillion, fifty-one billion, fifty-six million, five hundred forty thousand, five hundred eighty-one".