91298023 has 4 divisors (see below), whose sum is σ = 91401840. Its totient is φ = 91194208.

The previous prime is 91297991. The next prime is 91298027. The reversal of 91298023 is 32089219.

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 91298023 - 2⁵ = 91297991 is a prime.

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 91298023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91298027) 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, 50578 + ... + 52351.

It is an arithmetic number, because the mean of its divisors is an integer number (22850460).

Almost surely, 2^91298023 is an apocalyptic number.

91298023 is a deficient number, since it is larger than the sum of its proper divisors (103817).

91298023 is a wasteful number, since it uses less digits than its factorization.

91298023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103816.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 91298023 is about 9554.9998953428. Note that the first 3 decimals coincide. The cubic root of 91298023 is about 450.2846314512.

The spelling of 91298023 in words is "ninety-one million, two hundred ninety-eight thousand, twenty-three".