11891311 has 4 divisors (see below), whose sum is σ = 11977000. Its totient is φ = 11805624.

The previous prime is 11891303. The next prime is 11891323. The reversal of 11891311 is 11319811.

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 11891311 - 2³ = 11891303 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 (11891371) 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, 42636 + ... + 42913.

It is an arithmetic number, because the mean of its divisors is an integer number (2994250).

Almost surely, 2^11891311 is an apocalyptic number.

11891311 is a deficient number, since it is larger than the sum of its proper divisors (85689).

11891311 is an equidigital number, since it uses as much as digits as its factorization.

11891311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85688.

The product of its digits is 216, while the sum is 25.

The square root of 11891311 is about 3448.3780245211. The cubic root of 11891311 is about 228.2495408289.

It can be divided in two parts, 1189 and 1311, that added together give a square (2500 = 50²).

The spelling of 11891311 in words is "eleven million, eight hundred ninety-one thousand, three hundred eleven".