90909109191 has 8 divisors (see below), whose sum is σ = 121214621680. Its totient is φ = 60604834752.

The previous prime is 90909109177. The next prime is 90909109211. The reversal of 90909109191 is 19190190909.

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

It is not a de Polignac number, because 90909109191 - 2¹⁰ = 90909108167 is a prime.

It is a super-2 number, since 2×90909109191² (a number of 23 digits) contains 22 as substring.

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 90909109191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90909109171) 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, 121936 + ... + 443493.

It is an arithmetic number, because the mean of its divisors is an integer number (15151827710).

Almost surely, 2^90909109191 is an apocalyptic number.

90909109191 is a deficient number, since it is larger than the sum of its proper divisors (30305512489).

90909109191 is a wasteful number, since it uses less digits than its factorization.

90909109191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619025.

The product of its (nonzero) digits is 59049, while the sum is 48.

The spelling of 90909109191 in words is "ninety billion, nine hundred nine million, one hundred nine thousand, one hundred ninety-one".