851863 has 2 divisors, whose sum is σ = 851864. Its totient is φ = 851862.

The previous prime is 851843. The next prime is 851881. The reversal of 851863 is 368158.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 851863 - 2⁵ = 851831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425931 + 425932.

It is an arithmetic number, because the mean of its divisors is an integer number (425932).

2⁸⁵¹⁸⁶³ is an apocalyptic number.

851863 is a deficient number, since it is larger than the sum of its proper divisors (1).

851863 is an equidigital number, since it uses as much as digits as its factorization.

851863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 31.

The square root of 851863 is about 922.9642463281. The cubic root of 851863 is about 94.7959795217.

The spelling of 851863 in words is "eight hundred fifty-one thousand, eight hundred sixty-three".