853691 has 4 divisors (see below), whose sum is σ = 890832. Its totient is φ = 816552.

The previous prime is 853687. The next prime is 853693. The reversal of 853691 is 196358.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196358 = 2 ⋅98179.

It is a cyclic number.

It is not a de Polignac number, because 853691 - 2² = 853687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (853693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18536 + ... + 18581.

It is an arithmetic number, because the mean of its divisors is an integer number (222708).

2⁸⁵³⁶⁹¹ is an apocalyptic number.

853691 is a deficient number, since it is larger than the sum of its proper divisors (37141).

853691 is a wasteful number, since it uses less digits than its factorization.

853691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37140.

The product of its digits is 6480, while the sum is 32.

The square root of 853691 is about 923.9540031841. The cubic root of 853691 is about 94.8637381663.

The spelling of 853691 in words is "eight hundred fifty-three thousand, six hundred ninety-one".