11552991 has 24 divisors (see below), whose sum is σ = 16546320. Its totient is φ = 7160832.

The previous prime is 11552977. The next prime is 11553029. The reversal of 11552991 is 19925511.

It is a happy number.

11552991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11552991 - 2⁶ = 11552927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11552941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 119055 + ... + 119151.

It is an arithmetic number, because the mean of its divisors is an integer number (689430).

Almost surely, 2^11552991 is an apocalyptic number.

11552991 is a deficient number, since it is larger than the sum of its proper divisors (4993329).

11552991 is an equidigital number, since it uses as much as digits as its factorization.

11552991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 166 counting only the distinct ones).

The product of its digits is 4050, while the sum is 33.

The square root of 11552991 is about 3398.9691084210. The cubic root of 11552991 is about 226.0640367261.

The spelling of 11552991 in words is "eleven million, five hundred fifty-two thousand, nine hundred ninety-one".