11091491 has 2 divisors, whose sum is σ = 11091492. Its totient is φ = 11091490.

The previous prime is 11091481. The next prime is 11091503. The reversal of 11091491 is 19419011.

11091491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (19419011) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11091491 is a prime.

It is equal to p₇₃₂₁₇₆ and since 11091491 and 732176 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11091491.

It is not a weakly prime, because it can be changed into another prime (11091461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5545745 + 5545746.

It is an arithmetic number, because the mean of its divisors is an integer number (5545746).

Almost surely, 2^11091491 is an apocalyptic number.

11091491 is a deficient number, since it is larger than the sum of its proper divisors (1).

11091491 is an equidigital number, since it uses as much as digits as its factorization.

11091491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 11091491 is about 3330.3890163163. The cubic root of 11091491 is about 223.0128958203.

The spelling of 11091491 in words is "eleven million, ninety-one thousand, four hundred ninety-one".