11559991 has 16 divisors (see below), whose sum is σ = 12418560. Its totient is φ = 10745280.

The previous prime is 11559973. The next prime is 11559997. The reversal of 11559991 is 19995511.

It is not a de Polignac number, because 11559991 - 2⁹ = 11559479 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 (11559997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139236 + ... + 139318.

It is an arithmetic number, because the mean of its divisors is an integer number (776160).

Almost surely, 2^11559991 is an apocalyptic number.

11559991 is a deficient number, since it is larger than the sum of its proper divisors (858569).

11559991 is an equidigital number, since it uses as much as digits as its factorization.

11559991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246.

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

The square root of 11559991 is about 3399.9986764703. The cubic root of 11559991 is about 226.1096851866.

It can be divided in two parts, 115 and 59991, that added together give a palindrome (60106).

The spelling of 11559991 in words is "eleven million, five hundred fifty-nine thousand, nine hundred ninety-one".