18266231 has 2 divisors, whose sum is σ = 18266232. Its totient is φ = 18266230.

The previous prime is 18266207. The next prime is 18266233. The reversal of 18266231 is 13266281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18266231 - 2²² = 14071927 is a prime.

It is a super-2 number, since 2×18266231² = 667310389890722, which contains 22 as substring.

Together with 18266233, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18266194 and 18266203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18266233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9133115 + 9133116.

It is an arithmetic number, because the mean of its divisors is an integer number (9133116).

Almost surely, 2^18266231 is an apocalyptic number.

18266231 is a deficient number, since it is larger than the sum of its proper divisors (1).

18266231 is an equidigital number, since it uses as much as digits as its factorization.

18266231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 18266231 is about 4273.9011453238. The cubic root of 18266231 is about 263.3598999350.

The spelling of 18266231 in words is "eighteen million, two hundred sixty-six thousand, two hundred thirty-one".