90111109 has 8 divisors (see below), whose sum is σ = 98604000. Its totient is φ = 81668400.

The previous prime is 90111107. The next prime is 90111143.

90111109 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 90111109 - 2¹ = 90111107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90111109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90111103) 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, 8734 + ... + 16015.

It is an arithmetic number, because the mean of its divisors is an integer number (12325500).

Almost surely, 2^90111109 is an apocalyptic number.

It is an amenable number.

90111109 is a deficient number, since it is larger than the sum of its proper divisors (8492891).

90111109 is a wasteful number, since it uses less digits than its factorization.

90111109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25091.

The product of its (nonzero) digits is 81, while the sum is 22.

The square root of 90111109 is about 9492.6871327354. The cubic root of 90111109 is about 448.3248152621.

The spelling of 90111109 in words is "ninety million, one hundred eleven thousand, one hundred nine".