18341431331 has 2 divisors, whose sum is σ = 18341431332. Its totient is φ = 18341431330.

The previous prime is 18341431327. The next prime is 18341431373. The reversal of 18341431331 is 13313414381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18341431331 - 2² = 18341431327 is a prime.

It is a super-2 number, since 2×18341431331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18341431391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9170715665 + 9170715666.

It is an arithmetic number, because the mean of its divisors is an integer number (9170715666).

Almost surely, 2^18341431331 is an apocalyptic number.

18341431331 is a deficient number, since it is larger than the sum of its proper divisors (1).

18341431331 is an equidigital number, since it uses as much as digits as its factorization.

18341431331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The spelling of 18341431331 in words is "eighteen billion, three hundred forty-one million, four hundred thirty-one thousand, three hundred thirty-one".