18316819 has 2 divisors, whose sum is σ = 18316820. Its totient is φ = 18316818.

The previous prime is 18316807. The next prime is 18316849. The reversal of 18316819 is 91861381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18316819 - 2⁵ = 18316787 is a prime.

It is a super-2 number, since 2×18316819² = 671011716557522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18316849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9158409 + 9158410.

It is an arithmetic number, because the mean of its divisors is an integer number (9158410).

Almost surely, 2^18316819 is an apocalyptic number.

18316819 is a deficient number, since it is larger than the sum of its proper divisors (1).

18316819 is an equidigital number, since it uses as much as digits as its factorization.

18316819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 37.

The square root of 18316819 is about 4279.8152997530. The cubic root of 18316819 is about 263.6027993482.

The spelling of 18316819 in words is "eighteen million, three hundred sixteen thousand, eight hundred nineteen".