11491885 has 4 divisors (see below), whose sum is σ = 13790268. Its totient is φ = 9193504.

The previous prime is 11491877. The next prime is 11491889. The reversal of 11491885 is 58819411.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9126441 + 2365444 = 3021^2 + 1538^2 .

It is a cyclic number.

It is not a de Polignac number, because 11491885 - 2³ = 11491877 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 (11491889) 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, 1149184 + ... + 1149193.

It is an arithmetic number, because the mean of its divisors is an integer number (3447567).

Almost surely, 2^11491885 is an apocalyptic number.

It is an amenable number.

11491885 is a deficient number, since it is larger than the sum of its proper divisors (2298383).

11491885 is an equidigital number, since it uses as much as digits as its factorization.

11491885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298382.

The product of its digits is 11520, while the sum is 37.

The square root of 11491885 is about 3389.9682889372. The cubic root of 11491885 is about 225.6647665115.

The spelling of 11491885 in words is "eleven million, four hundred ninety-one thousand, eight hundred eighty-five".