18116731 has 2 divisors, whose sum is σ = 18116732. Its totient is φ = 18116730.

The previous prime is 18116729. The next prime is 18116767. The reversal of 18116731 is 13761181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18116731 - 2¹ = 18116729 is a prime.

It is a super-2 number, since 2×18116731² = 656431884252722, which contains 22 as substring.

Together with 18116729, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18116731.

It is not a weakly prime, because it can be changed into another prime (18116531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9058365 + 9058366.

It is an arithmetic number, because the mean of its divisors is an integer number (9058366).

Almost surely, 2^18116731 is an apocalyptic number.

18116731 is a deficient number, since it is larger than the sum of its proper divisors (1).

18116731 is an equidigital number, since it uses as much as digits as its factorization.

18116731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 28.

The square root of 18116731 is about 4256.3753358932. The cubic root of 18116731 is about 262.6394409569.

The spelling of 18116731 in words is "eighteen million, one hundred sixteen thousand, seven hundred thirty-one".