18132229 has 2 divisors, whose sum is σ = 18132230. Its totient is φ = 18132228.

The previous prime is 18132199. The next prime is 18132239. The reversal of 18132229 is 92223181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15249025 + 2883204 = 3905^2 + 1698^2 .

It is a cyclic number.

It is not a de Polignac number, because 18132229 - 2¹³ = 18124037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18132197 and 18132206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18132239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9066114 + 9066115.

It is an arithmetic number, because the mean of its divisors is an integer number (9066115).

Almost surely, 2^18132229 is an apocalyptic number.

It is an amenable number.

18132229 is a deficient number, since it is larger than the sum of its proper divisors (1).

18132229 is an equidigital number, since it uses as much as digits as its factorization.

18132229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 18132229 is about 4258.1955098375. The cubic root of 18132229 is about 262.7143114534.

The spelling of 18132229 in words is "eighteen million, one hundred thirty-two thousand, two hundred twenty-nine".