90135239 has 2 divisors, whose sum is σ = 90135240. Its totient is φ = 90135238.

The previous prime is 90135211. The next prime is 90135263. The reversal of 90135239 is 93253109.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90135239 - 2²⁰ = 89086663 is a prime.

It is a super-2 number, since 2×90135239² = 16248722619174242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90135289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45067619 + 45067620.

It is an arithmetic number, because the mean of its divisors is an integer number (45067620).

Almost surely, 2^90135239 is an apocalyptic number.

90135239 is a deficient number, since it is larger than the sum of its proper divisors (1).

90135239 is an equidigital number, since it uses as much as digits as its factorization.

90135239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 90135239 is about 9493.9580260290. The cubic root of 90135239 is about 448.3648292420.

The spelling of 90135239 in words is "ninety million, one hundred thirty-five thousand, two hundred thirty-nine".