1315866981 has 32 divisors (see below), whose sum is σ = 2073673728. Its totient is φ = 731701440.

The previous prime is 1315866973. The next prime is 1315867009. The reversal of 1315866981 is 1896685131.

It is not a de Polignac number, because 1315866981 - 2³ = 1315866973 is a prime.

It is a super-2 number, since 2×1315866981² = 3463011823372108722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1315866981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315866901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62460 + ... + 80826.

It is an arithmetic number, because the mean of its divisors is an integer number (64802304).

Almost surely, 2^1315866981 is an apocalyptic number.

1315866981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1315866981 is a deficient number, since it is larger than the sum of its proper divisors (757806747).

1315866981 is a wasteful number, since it uses less digits than its factorization.

1315866981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18561.

The product of its digits is 311040, while the sum is 48.

The square root of 1315866981 is about 36274.8808543874. The cubic root of 1315866981 is about 1095.8152241137.

The spelling of 1315866981 in words is "one billion, three hundred fifteen million, eight hundred sixty-six thousand, nine hundred eighty-one".