985691 has 4 divisors (see below), whose sum is σ = 1126512. Its totient is φ = 844872.

The previous prime is 985679. The next prime is 985703. The reversal of 985691 is 196589.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196589 = 73 ⋅2693.

It is an interprime number because it is at equal distance from previous prime (985679) and next prime (985703).

It is not a de Polignac number, because 985691 - 2¹⁰ = 984667 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 985691.

It is not an unprimeable number, because it can be changed into a prime (985601) 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, 70400 + ... + 70413.

It is an arithmetic number, because the mean of its divisors is an integer number (281628).

2⁹⁸⁵⁶⁹¹ is an apocalyptic number.

985691 is a deficient number, since it is larger than the sum of its proper divisors (140821).

985691 is a wasteful number, since it uses less digits than its factorization.

985691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140820.

The product of its digits is 19440, while the sum is 38.

The square root of 985691 is about 992.8197218025. The cubic root of 985691 is about 99.5207401022.

The spelling of 985691 in words is "nine hundred eighty-five thousand, six hundred ninety-one".