18708091 has 2 divisors, whose sum is σ = 18708092. Its totient is φ = 18708090.

The previous prime is 18708089. The next prime is 18708101. The reversal of 18708091 is 19080781.

It is a weak prime.

It is an emirp because it is prime and its reverse (19080781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18708091 - 2¹ = 18708089 is a prime.

Together with 18708089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18708191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9354045 + 9354046.

It is an arithmetic number, because the mean of its divisors is an integer number (9354046).

Almost surely, 2^18708091 is an apocalyptic number.

18708091 is a deficient number, since it is larger than the sum of its proper divisors (1).

18708091 is an equidigital number, since it uses as much as digits as its factorization.

18708091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 18708091 is about 4325.2850773099. The cubic root of 18708091 is about 265.4665614958.

The spelling of 18708091 in words is "eighteen million, seven hundred eight thousand, ninety-one".