1199080891 has 8 divisors (see below), whose sum is σ = 1214252640. Its totient is φ = 1183947072.

The previous prime is 1199080889. The next prime is 1199080903. The reversal of 1199080891 is 1980809911.

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

It is a cyclic number.

It is not a de Polignac number, because 1199080891 - 2¹ = 1199080889 is a prime.

It is a super-3 number, since 3×1199080891³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1199080811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57061 + ... + 75193.

It is an arithmetic number, because the mean of its divisors is an integer number (151781580).

Almost surely, 2^1199080891 is an apocalyptic number.

1199080891 is a deficient number, since it is larger than the sum of its proper divisors (15171749).

1199080891 is an equidigital number, since it uses as much as digits as its factorization.

1199080891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18965.

The product of its (nonzero) digits is 46656, while the sum is 46.

The square root of 1199080891 is about 34627.7474144652. The cubic root of 1199080891 is about 1062.3871945937.

It can be divided in two parts, 11 and 99080891, that multiplied together give a palindrome (1089889801).

The spelling of 1199080891 in words is "one billion, one hundred ninety-nine million, eighty thousand, eight hundred ninety-one".