11918197 has 4 divisors (see below), whose sum is σ = 11925760. Its totient is φ = 11910636.

The previous prime is 11918189. The next prime is 11918201. The reversal of 11918197 is 79181911.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11918197 - 2³ = 11918189 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 (11918297) 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, 423 + ... + 4900.

It is an arithmetic number, because the mean of its divisors is an integer number (2981440).

Almost surely, 2^11918197 is an apocalyptic number.

It is an amenable number.

11918197 is a deficient number, since it is larger than the sum of its proper divisors (7563).

11918197 is an equidigital number, since it uses as much as digits as its factorization.

11918197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7562.

The product of its digits is 4536, while the sum is 37.

The square root of 11918197 is about 3452.2741779876. The cubic root of 11918197 is about 228.4214337895.

The spelling of 11918197 in words is "eleven million, nine hundred eighteen thousand, one hundred ninety-seven".