1315107981 has 84 divisors (see below), whose sum is σ = 2297411676. Its totient is φ = 749295360.

The previous prime is 1315107977. The next prime is 1315108019. The reversal of 1315107981 is 1897015131.

1315107981 is a `hidden beast` number, since 131 + 510 + 7 + 9 + 8 + 1 = 666.

1315107981 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1067328900 + 247779081 = 32670^2 + 15741^2 .

It is not a de Polignac number, because 1315107981 - 2² = 1315107977 is a prime.

It is a super-2 number, since 2×1315107981² = 3459018003379792722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315107901) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 1499115 + ... + 1499991.

It is an arithmetic number, because the mean of its divisors is an integer number (27350139).

Almost surely, 2^1315107981 is an apocalyptic number.

1315107981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1315107981 is a deficient number, since it is larger than the sum of its proper divisors (982303695).

1315107981 is an equidigital number, since it uses as much as digits as its factorization.

1315107981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 36.

The square root of 1315107981 is about 36264.4175604683. The cubic root of 1315107981 is about 1095.6044926511.

The spelling of 1315107981 in words is "one billion, three hundred fifteen million, one hundred seven thousand, nine hundred eighty-one".