11723591 has 16 divisors (see below), whose sum is σ = 13747968. Its totient is φ = 9878400.

The previous prime is 11723573. The next prime is 11723599. The reversal of 11723591 is 19532711.

11723591 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11723591 - 2⁶ = 11723527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11723599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12836 + ... + 13718.

It is an arithmetic number, because the mean of its divisors is an integer number (859248).

Almost surely, 2^11723591 is an apocalyptic number.

11723591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11723591 is a deficient number, since it is larger than the sum of its proper divisors (2024377).

11723591 is a wasteful number, since it uses less digits than its factorization.

11723591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982.

The product of its digits is 1890, while the sum is 29.

The square root of 11723591 is about 3423.9729847065. The cubic root of 11723591 is about 227.1713468854.

The spelling of 11723591 in words is "eleven million, seven hundred twenty-three thousand, five hundred ninety-one".