850631 has 2 divisors, whose sum is σ = 850632. Its totient is φ = 850630.

The previous prime is 850613. The next prime is 850637. The reversal of 850631 is 136058.

Together with previous prime (850613) 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 not a de Polignac number, because 850631 - 2⁶ = 850567 is a prime.

It is a super-2 number, since 2×850631² = 1447146196322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 850597 and 850606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (850637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425315 + 425316.

It is an arithmetic number, because the mean of its divisors is an integer number (425316).

2⁸⁵⁰⁶³¹ is an apocalyptic number.

850631 is a deficient number, since it is larger than the sum of its proper divisors (1).

850631 is an equidigital number, since it uses as much as digits as its factorization.

850631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 850631 is about 922.2965900403. The cubic root of 850631 is about 94.7502581661.

Adding to 850631 its reverse (136058), we get a palindrome (986689).

The spelling of 850631 in words is "eight hundred fifty thousand, six hundred thirty-one".