1315931 has 2 divisors, whose sum is σ = 1315932. Its totient is φ = 1315930.

The previous prime is 1315927. The next prime is 1315943. The reversal of 1315931 is 1395131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1315931 - 2² = 1315927 is a prime.

It is a super-2 number, since 2×1315931² = 3463348793522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1315897 and 1315906.

It is not a weakly prime, because it can be changed into another prime (1315901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657965 + 657966.

It is an arithmetic number, because the mean of its divisors is an integer number (657966).

2^1315931 is an apocalyptic number.

1315931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315931 is an equidigital number, since it uses as much as digits as its factorization.

1315931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 405, while the sum is 23.

The square root of 1315931 is about 1147.1403575849. The cubic root of 1315931 is about 109.5832994871.

The spelling of 1315931 in words is "one million, three hundred fifteen thousand, nine hundred thirty-one".