1318931 has 2 divisors, whose sum is σ = 1318932. Its totient is φ = 1318930.

The previous prime is 1318927. The next prime is 1318937. The reversal of 1318931 is 1398131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1318931 - 2² = 1318927 is a prime.

It is a super-2 number, since 2×1318931² = 3479157965522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1318931.

It is not a weakly prime, because it can be changed into another prime (1318937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659465 + 659466.

It is an arithmetic number, because the mean of its divisors is an integer number (659466).

2^1318931 is an apocalyptic number.

1318931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318931 is an equidigital number, since it uses as much as digits as its factorization.

1318931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 1318931 is about 1148.4472125440. The cubic root of 1318931 is about 109.6665106360. Note that the first 3 decimals are identical.

The spelling of 1318931 in words is "one million, three hundred eighteen thousand, nine hundred thirty-one".