91923213 has 8 divisors (see below), whose sum is σ = 123376576. Its totient is φ = 60876000.

The previous prime is 91923187. The next prime is 91923229. The reversal of 91923213 is 31232919.

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 91923213 - 2¹⁰ = 91922189 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 (91923113) 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, 101008 + ... + 101913.

It is an arithmetic number, because the mean of its divisors is an integer number (15422072).

Almost surely, 2^91923213 is an apocalyptic number.

It is an amenable number.

91923213 is a deficient number, since it is larger than the sum of its proper divisors (31453363).

91923213 is a wasteful number, since it uses less digits than its factorization.

91923213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203075.

The product of its digits is 2916, while the sum is 30.

The square root of 91923213 is about 9587.6594119733. The cubic root of 91923213 is about 451.3101129495.

The spelling of 91923213 in words is "ninety-one million, nine hundred twenty-three thousand, two hundred thirteen".