11993591 has 2 divisors, whose sum is σ = 11993592. Its totient is φ = 11993590.

The previous prime is 11993581. The next prime is 11993593. The reversal of 11993591 is 19539911.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11993591 is a prime.

Together with 11993593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11993593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5996795 + 5996796.

It is an arithmetic number, because the mean of its divisors is an integer number (5996796).

Almost surely, 2^11993591 is an apocalyptic number.

11993591 is a deficient number, since it is larger than the sum of its proper divisors (1).

11993591 is an equidigital number, since it uses as much as digits as its factorization.

11993591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10935, while the sum is 38.

The square root of 11993591 is about 3463.1764321212. The cubic root of 11993591 is about 228.9020830659.

The spelling of 11993591 in words is "eleven million, nine hundred ninety-three thousand, five hundred ninety-one".