11309891 has 8 divisors (see below), whose sum is σ = 11647104. Its totient is φ = 10975680.

The previous prime is 11309873. The next prime is 11309897. The reversal of 11309891 is 19890311.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11309891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11309897) 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 7 ways as a sum of consecutive naturals, for example, 8525 + ... + 9761.

It is an arithmetic number, because the mean of its divisors is an integer number (1455888).

Almost surely, 2^11309891 is an apocalyptic number.

11309891 is a deficient number, since it is larger than the sum of its proper divisors (337213).

11309891 is a wasteful number, since it uses less digits than its factorization.

11309891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 11309891 is about 3363.0181385178. The cubic root of 11309891 is about 224.4671572301.

The spelling of 11309891 in words is "eleven million, three hundred nine thousand, eight hundred ninety-one".