891129 has 8 divisors (see below), whose sum is σ = 1197280. Its totient is φ = 589536.

The previous prime is 891103. The next prime is 891133. The reversal of 891129 is 921198.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 891129 - 2⁷ = 891001 is a prime.

It is a super-2 number, since 2×891129² = 1588221789282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 891096 and 891105.

It is not an unprimeable number, because it can be changed into a prime (891179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 652 + ... + 1485.

It is an arithmetic number, because the mean of its divisors is an integer number (149660).

2⁸⁹¹¹²⁹ is an apocalyptic number.

It is an amenable number.

891129 is a deficient number, since it is larger than the sum of its proper divisors (306151).

891129 is a wasteful number, since it uses less digits than its factorization.

891129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279.

The product of its digits is 1296, while the sum is 30.

The square root of 891129 is about 943.9962923656. The cubic root of 891129 is about 96.2306735807.

The spelling of 891129 in words is "eight hundred ninety-one thousand, one hundred twenty-nine".