91058972423 has 4 divisors (see below), whose sum is σ = 91078257048. Its totient is φ = 91039687800.

The previous prime is 91058972413. The next prime is 91058972449. The reversal of 91058972423 is 32427985019.

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

It is a cyclic number.

It is not a de Polignac number, because 91058972423 - 2²² = 91054778119 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 (91058972413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9635228 + ... + 9644673.

It is an arithmetic number, because the mean of its divisors is an integer number (22769564262).

Almost surely, 2^91058972423 is an apocalyptic number.

91058972423 is a deficient number, since it is larger than the sum of its proper divisors (19284625).

91058972423 is a wasteful number, since it uses less digits than its factorization.

91058972423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19284624.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 91058972423 in words is "ninety-one billion, fifty-eight million, nine hundred seventy-two thousand, four hundred twenty-three".