1187191885 has 16 divisors (see below), whose sum is σ = 1554811200. Its totient is φ = 863040640.

The previous prime is 1187191871. The next prime is 1187191931. The reversal of 1187191885 is 5881917811.

It is not a de Polignac number, because 1187191885 - 2⁵ = 1187191853 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253041 + ... + 257689.

It is an arithmetic number, because the mean of its divisors is an integer number (97175700).

Almost surely, 2^1187191885 is an apocalyptic number.

It is an amenable number.

1187191885 is a deficient number, since it is larger than the sum of its proper divisors (367619315).

1187191885 is a wasteful number, since it uses less digits than its factorization.

1187191885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9308.

The product of its digits is 161280, while the sum is 49.

The square root of 1187191885 is about 34455.6509879004. The cubic root of 1187191885 is about 1058.8643007179.

The spelling of 1187191885 in words is "one billion, one hundred eighty-seven million, one hundred ninety-one thousand, eight hundred eighty-five".