90509239 has 2 divisors, whose sum is σ = 90509240. Its totient is φ = 90509238.

The previous prime is 90509227. The next prime is 90509291. The reversal of 90509239 is 93290509.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90509239 - 2⁹ = 90508727 is a prime.

It is a super-3 number, since 3×90509239³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90509198 and 90509207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90509219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45254619 + 45254620.

It is an arithmetic number, because the mean of its divisors is an integer number (45254620).

Almost surely, 2^90509239 is an apocalyptic number.

90509239 is a deficient number, since it is larger than the sum of its proper divisors (1).

90509239 is an equidigital number, since it uses as much as digits as its factorization.

90509239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 90509239 is about 9513.6343738868. The cubic root of 90509239 is about 448.9841099662.

The spelling of 90509239 in words is "ninety million, five hundred nine thousand, two hundred thirty-nine".