1315231 has 2 divisors, whose sum is σ = 1315232. Its totient is φ = 1315230.

The previous prime is 1315229. The next prime is 1315243. The reversal of 1315231 is 1325131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1315231 - 2¹ = 1315229 is a prime.

It is a super-2 number, since 2×1315231² = 3459665166722, which contains 22 as substring.

Together with 1315229, it forms a pair of twin primes.

1315231 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1315211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657615 + 657616.

It is an arithmetic number, because the mean of its divisors is an integer number (657616).

2^1315231 is an apocalyptic number.

1315231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1315231 is an equidigital number, since it uses as much as digits as its factorization.

1315231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90, while the sum is 16.

The square root of 1315231 is about 1146.8352104814. The cubic root of 1315231 is about 109.5638653589.

The spelling of 1315231 in words is "one million, three hundred fifteen thousand, two hundred thirty-one".