91233983 has 4 divisors (see below), whose sum is σ = 91643328. Its totient is φ = 90824640.

The previous prime is 91233977. The next prime is 91233997. The reversal of 91233983 is 38933219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38933219 = 13 ⋅2994863.

It is a cyclic number.

It is not a de Polignac number, because 91233983 - 2¹⁰ = 91232959 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 (91233943) 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, 204338 + ... + 204783.

It is an arithmetic number, because the mean of its divisors is an integer number (22910832).

Almost surely, 2^91233983 is an apocalyptic number.

91233983 is a deficient number, since it is larger than the sum of its proper divisors (409345).

91233983 is a wasteful number, since it uses less digits than its factorization.

91233983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409344.

The product of its digits is 34992, while the sum is 38.

The square root of 91233983 is about 9551.6481823819. The cubic root of 91233983 is about 450.1793244147.

The spelling of 91233983 in words is "ninety-one million, two hundred thirty-three thousand, nine hundred eighty-three".