891959 has 4 divisors (see below), whose sum is σ = 916104. Its totient is φ = 867816.

The previous prime is 891929. The next prime is 891967. The reversal of 891959 is 959198.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959198 = 2 ⋅479599.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 891959.

It is not an unprimeable number, because it can be changed into a prime (891929) 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, 12017 + ... + 12090.

It is an arithmetic number, because the mean of its divisors is an integer number (229026).

2⁸⁹¹⁹⁵⁹ is an apocalyptic number.

891959 is a deficient number, since it is larger than the sum of its proper divisors (24145).

891959 is a wasteful number, since it uses less digits than its factorization.

891959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24144.

The product of its digits is 29160, while the sum is 41.

The square root of 891959 is about 944.4358104181. The cubic root of 891959 is about 96.2605408144.

It can be divided in two parts, 89 and 1959, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 891959 in words is "eight hundred ninety-one thousand, nine hundred fifty-nine".