891913 has 4 divisors (see below), whose sum is σ = 973008. Its totient is φ = 810820.

The previous prime is 891907. The next prime is 891923. The reversal of 891913 is 319198.

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 891913 - 2¹³ = 883721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891923) 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, 40531 + ... + 40552.

It is an arithmetic number, because the mean of its divisors is an integer number (243252).

2⁸⁹¹⁹¹³ is an apocalyptic number.

It is an amenable number.

891913 is a deficient number, since it is larger than the sum of its proper divisors (81095).

891913 is a wasteful number, since it uses less digits than its factorization.

891913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81094.

The product of its digits is 1944, while the sum is 31.

The square root of 891913 is about 944.4114569402. The cubic root of 891913 is about 96.2588860071.

It can be divided in two parts, 89 and 1913, that added together give a palindrome (2002).

The spelling of 891913 in words is "eight hundred ninety-one thousand, nine hundred thirteen".