985631 has 2 divisors, whose sum is σ = 985632. Its totient is φ = 985630.

The previous prime is 985613. The next prime is 985639. The reversal of 985631 is 136589.

Together with previous prime (985613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985631 is a prime.

It is a super-2 number, since 2×985631² = 1942936936322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985639) 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 as a sum of consecutive naturals, namely, 492815 + 492816.

It is an arithmetic number, because the mean of its divisors is an integer number (492816).

2⁹⁸⁵⁶³¹ is an apocalyptic number.

985631 is a deficient number, since it is larger than the sum of its proper divisors (1).

985631 is an equidigital number, since it uses as much as digits as its factorization.

985631 is an odious number, because the sum of its binary digits is odd.

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

The square root of 985631 is about 992.7895043764. The cubic root of 985631 is about 99.5187207521.

The spelling of 985631 in words is "nine hundred eighty-five thousand, six hundred thirty-one".