1144836891 has 48 divisors (see below), whose sum is σ = 1928489472. Its totient is φ = 647433600.

The previous prime is 1144836877. The next prime is 1144836893. The reversal of 1144836891 is 1986384411.

It is a de Polignac number, because none of the positive numbers 2^k-1144836891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1144836893) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87226 + ... + 99488.

It is an arithmetic number, because the mean of its divisors is an integer number (40176864).

Almost surely, 2^1144836891 is an apocalyptic number.

1144836891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1144836891 is a deficient number, since it is larger than the sum of its proper divisors (783652581).

1144836891 is a wasteful number, since it uses less digits than its factorization.

1144836891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12344 (or 12341 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 1144836891 is about 33835.4383893574. The cubic root of 1144836891 is about 1046.1192775274.

The spelling of 1144836891 in words is "one billion, one hundred forty-four million, eight hundred thirty-six thousand, eight hundred ninety-one".