891145144 has 32 divisors (see below), whose sum is σ = 1769058000. Its totient is φ = 419668992.

The previous prime is 891145139. The next prime is 891145153. The reversal of 891145144 is 441541198.

It is a congruent number.

It is an unprimeable number.

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, 9352 + ... + 43240.

Almost surely, 2^891145144 is an apocalyptic number.

It is an amenable number.

891145144 is a deficient number, since it is larger than the sum of its proper divisors (877912856).

891145144 is a wasteful number, since it uses less digits than its factorization.

891145144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34087 (or 34083 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 891145144 is about 29852.0542676714. The cubic root of 891145144 is about 962.3125469320.

The spelling of 891145144 in words is "eight hundred ninety-one million, one hundred forty-five thousand, one hundred forty-four".