91123583 has 2 divisors, whose sum is σ = 91123584. Its totient is φ = 91123582.

The previous prime is 91123573. The next prime is 91123619. The reversal of 91123583 is 38532119.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91123583 - 2⁴ = 91123567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91123573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45561791 + 45561792.

It is an arithmetic number, because the mean of its divisors is an integer number (45561792).

Almost surely, 2^91123583 is an apocalyptic number.

91123583 is a deficient number, since it is larger than the sum of its proper divisors (1).

91123583 is an equidigital number, since it uses as much as digits as its factorization.

91123583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 91123583 is about 9545.8673257070. The cubic root of 91123583 is about 449.9976674776.

The spelling of 91123583 in words is "ninety-one million, one hundred twenty-three thousand, five hundred eighty-three".