18180979 has 2 divisors, whose sum is σ = 18180980. Its totient is φ = 18180978.

The previous prime is 18180937. The next prime is 18180983. The reversal of 18180979 is 97908181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18180979 - 2²³ = 9792371 is a prime.

It is not a weakly prime, because it can be changed into another prime (18180479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9090489 + 9090490.

It is an arithmetic number, because the mean of its divisors is an integer number (9090490).

Almost surely, 2^18180979 is an apocalyptic number.

18180979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18180979 is an equidigital number, since it uses as much as digits as its factorization.

18180979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 18180979 is about 4263.9159231861. The cubic root of 18180979 is about 262.9495438297.

The spelling of 18180979 in words is "eighteen million, one hundred eighty thousand, nine hundred seventy-nine".