11561091 has 4 divisors (see below), whose sum is σ = 15414792. Its totient is φ = 7707392.

The previous prime is 11561089. The next prime is 11561117. The reversal of 11561091 is 19016511.

11561091 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11561091 - 2¹ = 11561089 is a prime.

It is a super-2 number, since 2×11561091² = 267317650220562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11561021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1926846 + ... + 1926851.

It is an arithmetic number, because the mean of its divisors is an integer number (3853698).

Almost surely, 2^11561091 is an apocalyptic number.

11561091 is a deficient number, since it is larger than the sum of its proper divisors (3853701).

11561091 is an equidigital number, since it uses as much as digits as its factorization.

11561091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3853700.

The product of its (nonzero) digits is 270, while the sum is 24.

The square root of 11561091 is about 3400.1604373912. The cubic root of 11561091 is about 226.1168568405.

The spelling of 11561091 in words is "eleven million, five hundred sixty-one thousand, ninety-one".