1191081509859 has 32 divisors (see below), whose sum is σ = 1765189601280. Its totient is φ = 710979033600.

The previous prime is 1191081509773. The next prime is 1191081509873. The reversal of 1191081509859 is 9589051801911.

It is not a de Polignac number, because 1191081509859 - 2⁸ = 1191081509603 is a prime.

It is a super-2 number, since 2×1191081509859² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1191081509799 and 1191081509808.

It is not an unprimeable number, because it can be changed into a prime (1191081509459) 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, 6291232 + ... + 6477789.

It is an arithmetic number, because the mean of its divisors is an integer number (55162175040).

Almost surely, 2^{1191081509859} is an apocalyptic number.

1191081509859 is a deficient number, since it is larger than the sum of its proper divisors (574108091421).

1191081509859 is a wasteful number, since it uses less digits than its factorization.

1191081509859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12769131.

The product of its (nonzero) digits is 1166400, while the sum is 57.

The spelling of 1191081509859 in words is "one trillion, one hundred ninety-one billion, eighty-one million, five hundred nine thousand, eight hundred fifty-nine".