90930091 has 4 divisors (see below), whose sum is σ = 103920112. Its totient is φ = 77940072.

The previous prime is 90930061. The next prime is 90930097. The reversal of 90930091 is 19003909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19003909 = 17 ⋅1117877.

It is not a de Polignac number, because 90930091 - 2⁷ = 90929963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90930097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6495000 + ... + 6495013.

It is an arithmetic number, because the mean of its divisors is an integer number (25980028).

Almost surely, 2^90930091 is an apocalyptic number.

90930091 is a deficient number, since it is larger than the sum of its proper divisors (12990021).

90930091 is a wasteful number, since it uses less digits than its factorization.

90930091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12990020.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 90930091 is about 9535.7270829235. The cubic root of 90930091 is about 449.6789331190.

The spelling of 90930091 in words is "ninety million, nine hundred thirty thousand, ninety-one".