1191195489 has 16 divisors (see below), whose sum is σ = 1747986624. Its totient is φ = 715545600.

The previous prime is 1191195487. The next prime is 1191195497. The reversal of 1191195489 is 9845911911.

It is not a de Polignac number, because 1191195489 - 2¹ = 1191195487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1191195487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155992 + ... + 163449.

It is an arithmetic number, because the mean of its divisors is an integer number (109249164).

Almost surely, 2^1191195489 is an apocalyptic number.

It is an amenable number.

1191195489 is a deficient number, since it is larger than the sum of its proper divisors (556791135).

1191195489 is a wasteful number, since it uses less digits than its factorization.

1191195489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319568.

The product of its digits is 116640, while the sum is 48.

The square root of 1191195489 is about 34513.7000189780. The cubic root of 1191195489 is about 1060.0532455157.

The spelling of 1191195489 in words is "one billion, one hundred ninety-one million, one hundred ninety-five thousand, four hundred eighty-nine".