90109109061 has 12 divisors (see below), whose sum is σ = 131940583788. Its totient is φ = 59249824704.

The previous prime is 90109109023. The next prime is 90109109063. The reversal of 90109109061 is 16090190109.

It can be written as a sum of positive squares in 2 ways, for example, as 16237130625 + 73871978436 = 127425^2 + 271794^2 .

It is not a de Polignac number, because 90109109061 - 2⁶ = 90109108997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90109109063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68575530 + ... + 68576843.

It is an arithmetic number, because the mean of its divisors is an integer number (10995048649).

Almost surely, 2^90109109061 is an apocalyptic number.

It is an amenable number.

90109109061 is a deficient number, since it is larger than the sum of its proper divisors (41831474727).

90109109061 is a wasteful number, since it uses less digits than its factorization.

90109109061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137152452 (or 137152449 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The spelling of 90109109061 in words is "ninety billion, one hundred nine million, one hundred nine thousand, sixty-one".