90723992191 has 8 divisors (see below), whose sum is σ = 109783654560. Its totient is φ = 73189102848.

The previous prime is 90723992173. The next prime is 90723992239. The reversal of 90723992191 is 19129932709.

It is a happy number.

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

It is not a de Polignac number, because 90723992191 - 2⁵ = 90723992159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90723992171) 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, 381193126 + ... + 381193363.

It is an arithmetic number, because the mean of its divisors is an integer number (13722956820).

Almost surely, 2^90723992191 is an apocalyptic number.

90723992191 is a deficient number, since it is larger than the sum of its proper divisors (19059662369).

90723992191 is a wasteful number, since it uses less digits than its factorization.

90723992191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762386513.

The product of its (nonzero) digits is 551124, while the sum is 52.

The spelling of 90723992191 in words is "ninety billion, seven hundred twenty-three million, nine hundred ninety-two thousand, one hundred ninety-one".