1317307981 has 16 divisors (see below), whose sum is σ = 1521483840. Its totient is φ = 1127934720.

The previous prime is 1317307973. The next prime is 1317307997. The reversal of 1317307981 is 1897037131.

It is not a de Polignac number, because 1317307981 - 2³ = 1317307973 is a prime.

It is a super-2 number, since 2×1317307981² = 3470600633612592722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317307921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17941 + ... + 54373.

It is an arithmetic number, because the mean of its divisors is an integer number (95092740).

Almost surely, 2^1317307981 is an apocalyptic number.

1317307981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1317307981 is a deficient number, since it is larger than the sum of its proper divisors (204175859).

1317307981 is a wasteful number, since it uses less digits than its factorization.

1317307981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36636.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 1317307981 is about 36294.7376488658. The cubic root of 1317307981 is about 1096.2150856247.

The spelling of 1317307981 in words is "one billion, three hundred seventeen million, three hundred seven thousand, nine hundred eighty-one".