18079181 has 2 divisors, whose sum is σ = 18079182. Its totient is φ = 18079180.

The previous prime is 18079153. The next prime is 18079183. The reversal of 18079181 is 18197081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11162281 + 6916900 = 3341^2 + 2630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18079181 is a prime.

It is a super-2 number, since 2×18079181² = 653713571261522, which contains 22 as substring.

Together with 18079183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18079183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9039590 + 9039591.

It is an arithmetic number, because the mean of its divisors is an integer number (9039591).

Almost surely, 2^18079181 is an apocalyptic number.

It is an amenable number.

18079181 is a deficient number, since it is larger than the sum of its proper divisors (1).

18079181 is an equidigital number, since it uses as much as digits as its factorization.

18079181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 35.

The square root of 18079181 is about 4251.9620177043. The cubic root of 18079181 is about 262.4578605070.

The spelling of 18079181 in words is "eighteen million, seventy-nine thousand, one hundred eighty-one".