90555509 has 8 divisors (see below), whose sum is σ = 99200640. Its totient is φ = 81979200.

The previous prime is 90555499. The next prime is 90555523.

It is a happy number.

90555509 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90555509 - 2²⁴ = 73778293 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90555589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14429 + ... + 19730.

It is an arithmetic number, because the mean of its divisors is an integer number (12400080).

Almost surely, 2^90555509 is an apocalyptic number.

It is an amenable number.

90555509 is a deficient number, since it is larger than the sum of its proper divisors (8645131).

90555509 is a wasteful number, since it uses less digits than its factorization.

90555509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34411.

The product of its (nonzero) digits is 50625, while the sum is 38.

The square root of 90555509 is about 9516.0658362582. The cubic root of 90555509 is about 449.0606065976.

The spelling of 90555509 in words is "ninety million, five hundred fifty-five thousand, five hundred nine".