11959591 has 4 divisors (see below), whose sum is σ = 13668112. Its totient is φ = 10251072.

The previous prime is 11959579. The next prime is 11959601. The reversal of 11959591 is 19595911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19595911 = 109 ⋅179779.

It is a cyclic number.

It is not a de Polignac number, because 11959591 - 2⁵ = 11959559 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 (11959561) 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, 854250 + ... + 854263.

It is an arithmetic number, because the mean of its divisors is an integer number (3417028).

Almost surely, 2^11959591 is an apocalyptic number.

11959591 is a deficient number, since it is larger than the sum of its proper divisors (1708521).

11959591 is an equidigital number, since it uses as much as digits as its factorization.

11959591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708520.

The product of its digits is 18225, while the sum is 40.

The square root of 11959591 is about 3458.2641599508. The cubic root of 11959591 is about 228.6855775267.

It can be divided in two parts, 11 and 959591, that multiplied together give a palindrome (10555501).

The spelling of 11959591 in words is "eleven million, nine hundred fifty-nine thousand, five hundred ninety-one".