18199331 has 2 divisors, whose sum is σ = 18199332. Its totient is φ = 18199330.

The previous prime is 18199319. The next prime is 18199361. The reversal of 18199331 is 13399181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18199331 - 2¹⁰ = 18198307 is a prime.

It is a super-2 number, since 2×18199331² = 662431297695122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18199291 and 18199300.

It is not a weakly prime, because it can be changed into another prime (18199361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9099665 + 9099666.

It is an arithmetic number, because the mean of its divisors is an integer number (9099666).

Almost surely, 2^18199331 is an apocalyptic number.

18199331 is a deficient number, since it is larger than the sum of its proper divisors (1).

18199331 is an equidigital number, since it uses as much as digits as its factorization.

18199331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 35.

The square root of 18199331 is about 4266.0673928104. The cubic root of 18199331 is about 263.0379884116.

The spelling of 18199331 in words is "eighteen million, one hundred ninety-nine thousand, three hundred thirty-one".