18291311 has 2 divisors, whose sum is σ = 18291312. Its totient is φ = 18291310.

The previous prime is 18291293. The next prime is 18291313. The reversal of 18291311 is 11319281.

It is a strong prime.

It is an emirp because it is prime and its reverse (11319281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18291311 - 2²² = 14097007 is a prime.

Together with 18291313, 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 (18291313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9145655 + 9145656.

It is an arithmetic number, because the mean of its divisors is an integer number (9145656).

Almost surely, 2^18291311 is an apocalyptic number.

18291311 is a deficient number, since it is larger than the sum of its proper divisors (1).

18291311 is an equidigital number, since it uses as much as digits as its factorization.

18291311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 26.

The square root of 18291311 is about 4276.8342263876. The cubic root of 18291311 is about 263.4803780935.

The spelling of 18291311 in words is "eighteen million, two hundred ninety-one thousand, three hundred eleven".