18313979 has 2 divisors, whose sum is σ = 18313980. Its totient is φ = 18313978.

The previous prime is 18313961. The next prime is 18313987. The reversal of 18313979 is 97931381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18313979 - 2¹⁶ = 18248443 is a prime.

It is not a weakly prime, because it can be changed into another prime (18313949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9156989 + 9156990.

It is an arithmetic number, because the mean of its divisors is an integer number (9156990).

Almost surely, 2^18313979 is an apocalyptic number.

18313979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18313979 is an equidigital number, since it uses as much as digits as its factorization.

18313979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 18313979 is about 4279.4834968720. The cubic root of 18313979 is about 263.5891748820.

The spelling of 18313979 in words is "eighteen million, three hundred thirteen thousand, nine hundred seventy-nine".