18081311 has 2 divisors, whose sum is σ = 18081312. Its totient is φ = 18081310.

The previous prime is 18081307. The next prime is 18081313. The reversal of 18081311 is 11318081.

It is a strong prime.

It is an emirp because it is prime and its reverse (11318081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18081311 - 2² = 18081307 is a prime.

Together with 18081313, 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 (18081313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9040655 + 9040656.

It is an arithmetic number, because the mean of its divisors is an integer number (9040656).

Almost surely, 2^18081311 is an apocalyptic number.

18081311 is a deficient number, since it is larger than the sum of its proper divisors (1).

18081311 is an equidigital number, since it uses as much as digits as its factorization.

18081311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 23.

The square root of 18081311 is about 4252.2124829317. The cubic root of 18081311 is about 262.4681672661.

Adding to 18081311 its reverse (11318081), we get a palindrome (29399392).

The spelling of 18081311 in words is "eighteen million, eighty-one thousand, three hundred eleven".