11197809 has 12 divisors (see below), whose sum is σ = 18485376. Its totient is φ = 6398712.

The previous prime is 11197807. The next prime is 11197817. The reversal of 11197809 is 90879111.

It is not a de Polignac number, because 11197809 - 2¹ = 11197807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11197801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88809 + ... + 88934.

It is an arithmetic number, because the mean of its divisors is an integer number (1540448).

Almost surely, 2^11197809 is an apocalyptic number.

It is an amenable number.

11197809 is a deficient number, since it is larger than the sum of its proper divisors (7287567).

11197809 is a wasteful number, since it uses less digits than its factorization.

11197809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177756 (or 177753 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 36.

The square root of 11197809 is about 3346.3127468902. The cubic root of 11197809 is about 223.7231978965.

The spelling of 11197809 in words is "eleven million, one hundred ninety-seven thousand, eight hundred nine".