18135149 has 2 divisors, whose sum is σ = 18135150. Its totient is φ = 18135148.

The previous prime is 18135137. The next prime is 18135151. The reversal of 18135149 is 94153181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16957924 + 1177225 = 4118^2 + 1085^2 .

It is a cyclic number.

It is not a de Polignac number, because 18135149 - 2¹⁶ = 18069613 is a prime.

Together with 18135151, 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 (18135119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9067574 + 9067575.

It is an arithmetic number, because the mean of its divisors is an integer number (9067575).

Almost surely, 2^18135149 is an apocalyptic number.

It is an amenable number.

18135149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18135149 is an equidigital number, since it uses as much as digits as its factorization.

18135149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 32.

The square root of 18135149 is about 4258.5383642748. The cubic root of 18135149 is about 262.7284131323.

The spelling of 18135149 in words is "eighteen million, one hundred thirty-five thousand, one hundred forty-nine".