889431891 has 12 divisors (see below), whose sum is σ = 1259773272. Its totient is φ = 558074368.

The previous prime is 889431889. The next prime is 889431899. The reversal of 889431891 is 198134988.

889431891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 889431891 - 2¹ = 889431889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (889431899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 512070 + ... + 513803.

It is an arithmetic number, because the mean of its divisors is an integer number (104981106).

Almost surely, 2^889431891 is an apocalyptic number.

889431891 is a deficient number, since it is larger than the sum of its proper divisors (370341381).

889431891 is a wasteful number, since it uses less digits than its factorization.

889431891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025910 (or 1025893 counting only the distinct ones).

The product of its digits is 497664, while the sum is 51.

The square root of 889431891 is about 29823.3447319378. The cubic root of 889431891 is about 961.6954598250.

The spelling of 889431891 in words is "eight hundred eighty-nine million, four hundred thirty-one thousand, eight hundred ninety-one".