18229511 has 2 divisors, whose sum is σ = 18229512. Its totient is φ = 18229510.

The previous prime is 18229507. The next prime is 18229513. The reversal of 18229511 is 11592281.

It is a strong prime.

It is an emirp because it is prime and its reverse (11592281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18229511 - 2² = 18229507 is a prime.

Together with 18229513, 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 (18229513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9114755 + 9114756.

It is an arithmetic number, because the mean of its divisors is an integer number (9114756).

Almost surely, 2^18229511 is an apocalyptic number.

18229511 is a deficient number, since it is larger than the sum of its proper divisors (1).

18229511 is an equidigital number, since it uses as much as digits as its factorization.

18229511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 29.

The square root of 18229511 is about 4269.6031431504. The cubic root of 18229511 is about 263.1833069838.

The spelling of 18229511 in words is "eighteen million, two hundred twenty-nine thousand, five hundred eleven".