11491771 has 4 divisors (see below), whose sum is σ = 11560752. Its totient is φ = 11422792.

The previous prime is 11491763. The next prime is 11491787. The reversal of 11491771 is 17719411.

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 11491771 - 2³ = 11491763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11491741) 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, 34240 + ... + 34573.

It is an arithmetic number, because the mean of its divisors is an integer number (2890188).

Almost surely, 2^11491771 is an apocalyptic number.

11491771 is a deficient number, since it is larger than the sum of its proper divisors (68981).

11491771 is an equidigital number, since it uses as much as digits as its factorization.

11491771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68980.

The product of its digits is 1764, while the sum is 31.

The square root of 11491771 is about 3389.9514745790. The cubic root of 11491771 is about 225.6640203076.

The spelling of 11491771 in words is "eleven million, four hundred ninety-one thousand, seven hundred seventy-one".