1191195113 has 4 divisors (see below), whose sum is σ = 1193746320. Its totient is φ = 1188643908.

The previous prime is 1191195091. The next prime is 1191195157. The reversal of 1191195113 is 3115911911.

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.

It is a cyclic number.

It is not a de Polignac number, because 1191195113 - 2⁸ = 1191194857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1191195113.

It is not an unprimeable number, because it can be changed into a prime (1191195163) 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, 1274903 + ... + 1275836.

It is an arithmetic number, because the mean of its divisors is an integer number (298436580).

Almost surely, 2^1191195113 is an apocalyptic number.

It is an amenable number.

1191195113 is a deficient number, since it is larger than the sum of its proper divisors (2551207).

1191195113 is an equidigital number, since it uses as much as digits as its factorization.

1191195113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551206.

The product of its digits is 1215, while the sum is 32.

The square root of 1191195113 is about 34513.6945718652. The cubic root of 1191195113 is about 1060.0531339807.

The spelling of 1191195113 in words is "one billion, one hundred ninety-one million, one hundred ninety-five thousand, one hundred thirteen".