891225889 has 4 divisors (see below), whose sum is σ = 891503280. Its totient is φ = 890948500.

The previous prime is 891225847. The next prime is 891225911. The reversal of 891225889 is 988522198.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 891225889 - 2¹¹ = 891223841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891223889) 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, 133819 + ... + 140320.

It is an arithmetic number, because the mean of its divisors is an integer number (222875820).

Almost surely, 2^891225889 is an apocalyptic number.

It is an amenable number.

891225889 is a deficient number, since it is larger than the sum of its proper divisors (277391).

891225889 is a wasteful number, since it uses less digits than its factorization.

891225889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277390.

The product of its digits is 829440, while the sum is 52.

The square root of 891225889 is about 29853.4066565275. The cubic root of 891225889 is about 962.3416105028.

The spelling of 891225889 in words is "eight hundred ninety-one million, two hundred twenty-five thousand, eight hundred eighty-nine".