1318831 has 2 divisors, whose sum is σ = 1318832. Its totient is φ = 1318830.

The previous prime is 1318829. The next prime is 1318841. The reversal of 1318831 is 1388131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1318831 - 2¹ = 1318829 is a prime.

It is a super-2 number, since 2×1318831² = 3478630413122, which contains 22 as substring.

Together with 1318829, it forms a pair of twin primes.

1318831 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1318796 and 1318805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1318841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659415 + 659416.

It is an arithmetic number, because the mean of its divisors is an integer number (659416).

2^1318831 is an apocalyptic number.

1318831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318831 is an equidigital number, since it uses as much as digits as its factorization.

1318831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

The square root of 1318831 is about 1148.4036746719. The cubic root of 1318831 is about 109.6637389651.

The spelling of 1318831 in words is "one million, three hundred eighteen thousand, eight hundred thirty-one".