91975823 has 2 divisors, whose sum is σ = 91975824. Its totient is φ = 91975822.

The previous prime is 91975817. The next prime is 91975837. The reversal of 91975823 is 32857919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91975823 - 2⁶ = 91975759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91975843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45987911 + 45987912.

It is an arithmetic number, because the mean of its divisors is an integer number (45987912).

Almost surely, 2^91975823 is an apocalyptic number.

91975823 is a deficient number, since it is larger than the sum of its proper divisors (1).

91975823 is an equidigital number, since it uses as much as digits as its factorization.

91975823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 91975823 is about 9590.4026505669. The cubic root of 91975823 is about 451.3961952931.

The spelling of 91975823 in words is "ninety-one million, nine hundred seventy-five thousand, eight hundred twenty-three".