1152776891 has 12 divisors (see below), whose sum is σ = 1343883528. Its totient is φ = 985959072.

The previous prime is 1152776857. The next prime is 1152776893. The reversal of 1152776891 is 1986772511.

It is a de Polignac number, because none of the positive numbers 2^k-1152776891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1152776893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2306 + ... + 48071.

It is an arithmetic number, because the mean of its divisors is an integer number (111990294).

Almost surely, 2^1152776891 is an apocalyptic number.

1152776891 is a deficient number, since it is larger than the sum of its proper divisors (191106637).

1152776891 is an equidigital number, since it uses as much as digits as its factorization.

1152776891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50858 (or 50851 counting only the distinct ones).

The product of its digits is 211680, while the sum is 47.

The square root of 1152776891 is about 33952.5682533737. The cubic root of 1152776891 is about 1048.5321563971.

The spelling of 1152776891 in words is "one billion, one hundred fifty-two million, seven hundred seventy-six thousand, eight hundred ninety-one".