855641 has 2 divisors, whose sum is σ = 855642. Its totient is φ = 855640.

The previous prime is 855619. The next prime is 855667. The reversal of 855641 is 146558.

It is a happy number.

855641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 855625 + 16 = 925^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 855641 - 2¹⁰ = 854617 is a prime.

It is a Chen prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 855641.

It is not a weakly prime, because it can be changed into another prime (855601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427820 + 427821.

It is an arithmetic number, because the mean of its divisors is an integer number (427821).

2⁸⁵⁵⁶⁴¹ is an apocalyptic number.

It is an amenable number.

855641 is a deficient number, since it is larger than the sum of its proper divisors (1).

855641 is an equidigital number, since it uses as much as digits as its factorization.

855641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

The square root of 855641 is about 925.0086486082. The cubic root of 855641 is about 94.9359124546.

The spelling of 855641 in words is "eight hundred fifty-five thousand, six hundred forty-one".