11491081 has 4 divisors (see below), whose sum is σ = 13132672. Its totient is φ = 9849492.

The previous prime is 11491069. The next prime is 11491091. The reversal of 11491081 is 18019411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18019411 = 29 ⋅621359.

It is a cyclic number.

It is not a de Polignac number, because 11491081 - 2¹¹ = 11489033 is a prime.

It is a super-2 number, since 2×11491081² = 264089885097122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11491001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 820785 + ... + 820798.

It is an arithmetic number, because the mean of its divisors is an integer number (3283168).

Almost surely, 2^11491081 is an apocalyptic number.

It is an amenable number.

11491081 is a deficient number, since it is larger than the sum of its proper divisors (1641591).

11491081 is an equidigital number, since it uses as much as digits as its factorization.

11491081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641590.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 11491081 is about 3389.8497016830. The cubic root of 11491081 is about 225.6595037049.

The spelling of 11491081 in words is "eleven million, four hundred ninety-one thousand, eighty-one".