90985511 has 4 divisors (see below), whose sum is σ = 91083552. Its totient is φ = 90887472.

The previous prime is 90985487. The next prime is 90985523. The reversal of 90985511 is 11558909.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90985511 - 2¹⁴ = 90969127 is a prime.

It is a super-3 number, since 3×90985511³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90985591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47615 + ... + 49488.

It is an arithmetic number, because the mean of its divisors is an integer number (22770888).

Almost surely, 2^90985511 is an apocalyptic number.

90985511 is a deficient number, since it is larger than the sum of its proper divisors (98041).

90985511 is an equidigital number, since it uses as much as digits as its factorization.

90985511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98040.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 90985511 is about 9538.6325539880. The cubic root of 90985511 is about 449.7702712189.

The spelling of 90985511 in words is "ninety million, nine hundred eighty-five thousand, five hundred eleven".