13315831 has 2 divisors, whose sum is σ = 13315832. Its totient is φ = 13315830.

The previous prime is 13315817. The next prime is 13315849. The reversal of 13315831 is 13851331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13315831 - 2⁷ = 13315703 is a prime.

It is a super-2 number, since 2×13315831² = 354622710441122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13315796 and 13315805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13315871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6657915 + 6657916.

It is an arithmetic number, because the mean of its divisors is an integer number (6657916).

Almost surely, 2^13315831 is an apocalyptic number.

13315831 is a deficient number, since it is larger than the sum of its proper divisors (1).

13315831 is an equidigital number, since it uses as much as digits as its factorization.

13315831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

The square root of 13315831 is about 3649.0863239995. The cubic root of 13315831 is about 237.0224183129.

It can be divided in two parts, 13 and 315831, that added together give a square (315844 = 562²).

The spelling of 13315831 in words is "thirteen million, three hundred fifteen thousand, eight hundred thirty-one".