1315361681 has 4 divisors (see below), whose sum is σ = 1315585392. Its totient is φ = 1315137972.

The previous prime is 1315361623. The next prime is 1315361717. The reversal of 1315361681 is 1861635131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1315361681 - 2⁶ = 1315361617 is a prime.

It is a super-2 number, since 2×1315361681² = 3460352703686291522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315361081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102791 + ... + 114876.

It is an arithmetic number, because the mean of its divisors is an integer number (328896348).

Almost surely, 2^1315361681 is an apocalyptic number.

It is an amenable number.

1315361681 is a deficient number, since it is larger than the sum of its proper divisors (223711).

1315361681 is an equidigital number, since it uses as much as digits as its factorization.

1315361681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223710.

The product of its digits is 12960, while the sum is 35.

The square root of 1315361681 is about 36267.9153109191. The cubic root of 1315361681 is about 1095.6749398417.

The spelling of 1315361681 in words is "one billion, three hundred fifteen million, three hundred sixty-one thousand, six hundred eighty-one".