891089369 has 2 divisors, whose sum is σ = 891089370. Its totient is φ = 891089368.

The previous prime is 891089363. The next prime is 891089377. The reversal of 891089369 is 963980198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 701614144 + 189475225 = 26488^2 + 13765^2 .

It is a cyclic number.

It is not a de Polignac number, because 891089369 - 2²⁰ = 890040793 is a prime.

It is a super-2 number, since 2×891089369² = 1588080527089636322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 891089369.

It is not a weakly prime, because it can be changed into another prime (891089363) 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 as a sum of consecutive naturals, namely, 445544684 + 445544685.

It is an arithmetic number, because the mean of its divisors is an integer number (445544685).

Almost surely, 2^891089369 is an apocalyptic number.

It is an amenable number.

891089369 is a deficient number, since it is larger than the sum of its proper divisors (1).

891089369 is an equidigital number, since it uses as much as digits as its factorization.

891089369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 891089369 is about 29851.1200627380. The cubic root of 891089369 is about 962.2924701045.

The spelling of 891089369 in words is "eight hundred ninety-one million, eighty-nine thousand, three hundred sixty-nine".