1315473581 has 2 divisors, whose sum is σ = 1315473582. Its totient is φ = 1315473580.

The previous prime is 1315473571. The next prime is 1315473613. The reversal of 1315473581 is 1853745131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 673662025 + 641811556 = 25955^2 + 25334^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315473581 - 2²⁶ = 1248364717 is a prime.

It is a super-2 number, since 2×1315473581² = 3460941484617927122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1315473541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657736790 + 657736791.

It is an arithmetic number, because the mean of its divisors is an integer number (657736791).

Almost surely, 2^1315473581 is an apocalyptic number.

It is an amenable number.

1315473581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315473581 is an equidigital number, since it uses as much as digits as its factorization.

1315473581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 38.

The square root of 1315473581 is about 36269.4579639674. The cubic root of 1315473581 is about 1095.7060092555.

The spelling of 1315473581 in words is "one billion, three hundred fifteen million, four hundred seventy-three thousand, five hundred eighty-one".