90992713205 has 4 divisors (see below), whose sum is σ = 109191255852. Its totient is φ = 72794170560.

The previous prime is 90992713193. The next prime is 90992713213. The reversal of 90992713205 is 50231729909.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61685669956 + 29307043249 = 248366^2 + 171193^2 .

It is not a de Polignac number, because 90992713205 - 2⁸ = 90992712949 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 90992713205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9099271316 + ... + 9099271325.

It is an arithmetic number, because the mean of its divisors is an integer number (27297813963).

Almost surely, 2^90992713205 is an apocalyptic number.

It is an amenable number.

90992713205 is a deficient number, since it is larger than the sum of its proper divisors (18198542647).

90992713205 is a wasteful number, since it uses less digits than its factorization.

90992713205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18198542646.

The product of its (nonzero) digits is 306180, while the sum is 47.

The spelling of 90992713205 in words is "ninety billion, nine hundred ninety-two million, seven hundred thirteen thousand, two hundred five".