18316831331 has 2 divisors, whose sum is σ = 18316831332. Its totient is φ = 18316831330.

The previous prime is 18316831321. The next prime is 18316831367. The reversal of 18316831331 is 13313861381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18316831331 - 2¹⁴ = 18316814947 is a prime.

It is a super-2 number, since 2×18316831331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18316831321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9158415665 + 9158415666.

It is an arithmetic number, because the mean of its divisors is an integer number (9158415666).

Almost surely, 2^18316831331 is an apocalyptic number.

18316831331 is a deficient number, since it is larger than the sum of its proper divisors (1).

18316831331 is an equidigital number, since it uses as much as digits as its factorization.

18316831331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 38.

The spelling of 18316831331 in words is "eighteen billion, three hundred sixteen million, eight hundred thirty-one thousand, three hundred thirty-one".