11284991 has 4 divisors (see below), whose sum is σ = 11948832. Its totient is φ = 10621152.

The previous prime is 11284981. The next prime is 11285009. The reversal of 11284991 is 19948211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19948211 = 79 ⋅252509.

It is a cyclic number.

It is not a de Polignac number, because 11284991 - 2²² = 7090687 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 (11284921) 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, 331895 + ... + 331928.

It is an arithmetic number, because the mean of its divisors is an integer number (2987208).

Almost surely, 2^11284991 is an apocalyptic number.

11284991 is a deficient number, since it is larger than the sum of its proper divisors (663841).

11284991 is an equidigital number, since it uses as much as digits as its factorization.

11284991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663840.

The product of its digits is 5184, while the sum is 35.

The square root of 11284991 is about 3359.3140668893. The cubic root of 11284991 is about 224.3023062746.

The spelling of 11284991 in words is "eleven million, two hundred eighty-four thousand, nine hundred ninety-one".