1191195491 has 32 divisors (see below), whose sum is σ = 1334361600. Its totient is φ = 1058365440.

The previous prime is 1191195487. The next prime is 1191195497. The reversal of 1191195491 is 1945911911.

It is a cyclic number.

It is not a de Polignac number, because 1191195491 - 2² = 1191195487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1191195497) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5112311 + ... + 5112543.

It is an arithmetic number, because the mean of its divisors is an integer number (41698800).

Almost surely, 2^1191195491 is an apocalyptic number.

1191195491 is a deficient number, since it is larger than the sum of its proper divisors (143166109).

1191195491 is a wasteful number, since it uses less digits than its factorization.

1191195491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479.

The product of its digits is 14580, while the sum is 41.

The square root of 1191195491 is about 34513.7000479520. The cubic root of 1191195491 is about 1060.0532461090.

The spelling of 1191195491 in words is "one billion, one hundred ninety-one million, one hundred ninety-five thousand, four hundred ninety-one".