1189491731999 has 8 divisors (see below), whose sum is σ = 1209358273200. Its totient is φ = 1169637019200.

The previous prime is 1189491731969. The next prime is 1189491732007. The reversal of 1189491731999 is 9991371949811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1189491731999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189491731959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2754182 + ... + 3156659.

It is an arithmetic number, because the mean of its divisors is an integer number (151169784150).

Almost surely, 2^{1189491731999} is an apocalyptic number.

1189491731999 is a deficient number, since it is larger than the sum of its proper divisors (19866541201).

1189491731999 is an equidigital number, since it uses as much as digits as its factorization.

1189491731999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5914201.

The product of its digits is 39680928, while the sum is 71.

The spelling of 1189491731999 in words is "one trillion, one hundred eighty-nine billion, four hundred ninety-one million, seven hundred thirty-one thousand, nine hundred ninety-nine".