1318913431 has 24 divisors (see below), whose sum is σ = 1539648432. Its totient is φ = 1125062400.

The previous prime is 1318913381. The next prime is 1318913441. The reversal of 1318913431 is 1343198131.

It is a happy number.

It is not a de Polignac number, because 1318913431 - 2⁷ = 1318913303 is a prime.

It is a super-2 number, since 2×1318913431² = 3479065276944383522, 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 (1318913441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 865236 + ... + 866758.

It is an arithmetic number, because the mean of its divisors is an integer number (64152018).

Almost surely, 2^1318913431 is an apocalyptic number.

1318913431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1318913431 is a deficient number, since it is larger than the sum of its proper divisors (220735001).

1318913431 is a wasteful number, since it uses less digits than its factorization.

1318913431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1983 (or 1972 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 1318913431 is about 36316.8477569296. The cubic root of 1318913431 is about 1096.6602369130.

The spelling of 1318913431 in words is "one billion, three hundred eighteen million, nine hundred thirteen thousand, four hundred thirty-one".