18368131 has 2 divisors, whose sum is σ = 18368132. Its totient is φ = 18368130.

The previous prime is 18368111. The next prime is 18368171. The reversal of 18368131 is 13186381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18368131 - 2¹⁹ = 17843843 is a prime.

It is a super-2 number, since 2×18368131² = 674776472866322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18368093 and 18368102.

It is not a weakly prime, because it can be changed into another prime (18368111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9184065 + 9184066.

It is an arithmetic number, because the mean of its divisors is an integer number (9184066).

Almost surely, 2^18368131 is an apocalyptic number.

18368131 is a deficient number, since it is larger than the sum of its proper divisors (1).

18368131 is an equidigital number, since it uses as much as digits as its factorization.

18368131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 31.

The square root of 18368131 is about 4285.8057585476. The cubic root of 18368131 is about 263.8487186147.

The spelling of 18368131 in words is "eighteen million, three hundred sixty-eight thousand, one hundred thirty-one".