18226121 has 2 divisors, whose sum is σ = 18226122. Its totient is φ = 18226120.

The previous prime is 18226093. The next prime is 18226139. The reversal of 18226121 is 12162281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14478025 + 3748096 = 3805^2 + 1936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18226121 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18226141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9113060 + 9113061.

It is an arithmetic number, because the mean of its divisors is an integer number (9113061).

Almost surely, 2^18226121 is an apocalyptic number.

It is an amenable number.

18226121 is a deficient number, since it is larger than the sum of its proper divisors (1).

18226121 is an equidigital number, since it uses as much as digits as its factorization.

18226121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 23.

The square root of 18226121 is about 4269.2061322920. The cubic root of 18226121 is about 263.1669919234.

The spelling of 18226121 in words is "eighteen million, two hundred twenty-six thousand, one hundred twenty-one".