855619 has 2 divisors, whose sum is σ = 855620. Its totient is φ = 855618.

The previous prime is 855607. The next prime is 855641. The reversal of 855619 is 916558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 855619 - 2¹¹ = 853571 is a prime.

It is a super-2 number, since 2×855619² = 1464167746322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (855119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427809 + 427810.

It is an arithmetic number, because the mean of its divisors is an integer number (427810).

2⁸⁵⁵⁶¹⁹ is an apocalyptic number.

855619 is a deficient number, since it is larger than the sum of its proper divisors (1).

855619 is an equidigital number, since it uses as much as digits as its factorization.

855619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

The square root of 855619 is about 924.9967567511. The cubic root of 855619 is about 94.9350987925.

The spelling of 855619 in words is "eight hundred fifty-five thousand, six hundred nineteen".