90111155 has 4 divisors (see below), whose sum is σ = 108133392. Its totient is φ = 72088920.

The previous prime is 90111143. The next prime is 90111179. The reversal of 90111155 is 55111109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55111109 = 1493 ⋅36913.

It is not a de Polignac number, because 90111155 - 2¹⁶ = 90045619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90111155.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9011111 + ... + 9011120.

It is an arithmetic number, because the mean of its divisors is an integer number (27033348).

Almost surely, 2^90111155 is an apocalyptic number.

90111155 is a deficient number, since it is larger than the sum of its proper divisors (18022237).

90111155 is a wasteful number, since it uses less digits than its factorization.

90111155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18022236.

The product of its (nonzero) digits is 225, while the sum is 23.

The square root of 90111155 is about 9492.6895556528. The cubic root of 90111155 is about 448.3248915491.

The spelling of 90111155 in words is "ninety million, one hundred eleven thousand, one hundred fifty-five".