11255991 has 8 divisors (see below), whose sum is σ = 15024000. Its totient is φ = 7495992.

The previous prime is 11255971. The next prime is 11256019. The reversal of 11255991 is 19955211.

It is a happy number.

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

It is not a de Polignac number, because 11255991 - 2⁶ = 11255927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11255911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3246 + ... + 5748.

It is an arithmetic number, because the mean of its divisors is an integer number (1878000).

Almost surely, 2^11255991 is an apocalyptic number.

11255991 is a deficient number, since it is larger than the sum of its proper divisors (3768009).

11255991 is a wasteful number, since it uses less digits than its factorization.

11255991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4005.

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

The square root of 11255991 is about 3354.9949329321. The cubic root of 11255991 is about 224.1100052262.

It can be divided in two parts, 11255 and 991, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 11255991 in words is "eleven million, two hundred fifty-five thousand, nine hundred ninety-one".