11988591 has 8 divisors (see below), whose sum is σ = 16027440. Its totient is φ = 7971072.

The previous prime is 11988577. The next prime is 11988607. The reversal of 11988591 is 19588911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11988591 - 2⁶ = 11988527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11988541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3970 + ... + 6303.

It is an arithmetic number, because the mean of its divisors is an integer number (2003430).

Almost surely, 2^11988591 is an apocalyptic number.

11988591 is a deficient number, since it is larger than the sum of its proper divisors (4038849).

11988591 is a wasteful number, since it uses less digits than its factorization.

11988591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10665.

The product of its digits is 25920, while the sum is 42.

The square root of 11988591 is about 3462.4544762350. The cubic root of 11988591 is about 228.8702697000.

The spelling of 11988591 in words is "eleven million, nine hundred eighty-eight thousand, five hundred ninety-one".