916891 has 4 divisors (see below), whose sum is σ = 931984. Its totient is φ = 901800.

The previous prime is 916879. The next prime is 916907. The reversal of 916891 is 198619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198619 = 83 ⋅2393.

It is a cyclic number.

It is not a de Polignac number, because 916891 - 2⁵ = 916859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (916831) 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, 7455 + ... + 7576.

It is an arithmetic number, because the mean of its divisors is an integer number (232996).

2⁹¹⁶⁸⁹¹ is an apocalyptic number.

916891 is a deficient number, since it is larger than the sum of its proper divisors (15093).

916891 is a wasteful number, since it uses less digits than its factorization.

916891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15092.

The product of its digits is 3888, while the sum is 34.

The square root of 916891 is about 957.5442548520. The cubic root of 916891 is about 97.1492017812.

It can be divided in two parts, 9 and 16891, that added together give a square (16900 = 130²).

The spelling of 916891 in words is "nine hundred sixteen thousand, eight hundred ninety-one".