891144227 has 4 divisors (see below), whose sum is σ = 892401840. Its totient is φ = 889886616.

The previous prime is 891144211. The next prime is 891144229. The reversal of 891144227 is 722441198.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 891144227 - 2⁴ = 891144211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891144229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627743 + ... + 629160.

It is an arithmetic number, because the mean of its divisors is an integer number (223100460).

Almost surely, 2^891144227 is an apocalyptic number.

891144227 is a deficient number, since it is larger than the sum of its proper divisors (1257613).

891144227 is a wasteful number, since it uses less digits than its factorization.

891144227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257612.

The product of its digits is 32256, while the sum is 38.

The square root of 891144227 is about 29852.0389085905. The cubic root of 891144227 is about 962.3122168545.

The spelling of 891144227 in words is "eight hundred ninety-one million, one hundred forty-four thousand, two hundred twenty-seven".