855919 has 2 divisors, whose sum is σ = 855920. Its totient is φ = 855918.

The previous prime is 855901. The next prime is 855923. The reversal of 855919 is 919558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855919 - 2⁵ = 855887 is a prime.

It is a super-2 number, since 2×855919² = 1465194669122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855989) 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, 427959 + 427960.

It is an arithmetic number, because the mean of its divisors is an integer number (427960).

2⁸⁵⁵⁹¹⁹ is an apocalyptic number.

855919 is a deficient number, since it is larger than the sum of its proper divisors (1).

855919 is an equidigital number, since it uses as much as digits as its factorization.

855919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 37.

The square root of 855919 is about 925.1589052698. The cubic root of 855919 is about 94.9461929834.

The spelling of 855919 in words is "eight hundred fifty-five thousand, nine hundred nineteen".