90909093 has 16 divisors (see below), whose sum is σ = 134402112. Its totient is φ = 54192000.

The previous prime is 90909089. The next prime is 90909101. The reversal of 90909093 is 39090909.

It is not a de Polignac number, because 90909093 - 2² = 90909089 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90909073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20568 + ... + 24593.

It is an arithmetic number, because the mean of its divisors is an integer number (8400132).

Almost surely, 2^90909093 is an apocalyptic number.

It is an amenable number.

90909093 is a deficient number, since it is larger than the sum of its proper divisors (43493019).

90909093 is a wasteful number, since it uses less digits than its factorization.

90909093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45236.

The product of its (nonzero) digits is 19683, while the sum is 39.

The square root of 90909093 is about 9534.6260021041. The cubic root of 90909093 is about 449.6443164699.

The spelling of 90909093 in words is "ninety million, nine hundred nine thousand, ninety-three".