11491789 has 8 divisors (see below), whose sum is σ = 12623040. Its totient is φ = 10413216.

The previous prime is 11491787. The next prime is 11491807. The reversal of 11491789 is 98719411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11491789 - 2¹ = 11491787 is a prime.

It is a super-2 number, since 2×11491789² = 264122428841042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11491787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12712 + ... + 13585.

It is an arithmetic number, because the mean of its divisors is an integer number (1577880).

Almost surely, 2^11491789 is an apocalyptic number.

11491789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11491789 is a deficient number, since it is larger than the sum of its proper divisors (1131251).

11491789 is a wasteful number, since it uses less digits than its factorization.

11491789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26339.

The product of its digits is 18144, while the sum is 40.

The square root of 11491789 is about 3389.9541294832. The cubic root of 11491789 is about 225.6641381296.

The spelling of 11491789 in words is "eleven million, four hundred ninety-one thousand, seven hundred eighty-nine".