855901 has 2 divisors, whose sum is σ = 855902. Its totient is φ = 855900.

The previous prime is 855889. The next prime is 855919. The reversal of 855901 is 109558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 811801 + 44100 = 901^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 855901 - 2¹⁹ = 331613 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 855901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427950 + 427951.

It is an arithmetic number, because the mean of its divisors is an integer number (427951).

2⁸⁵⁵⁹⁰¹ is an apocalyptic number.

It is an amenable number.

855901 is a deficient number, since it is larger than the sum of its proper divisors (1).

855901 is an equidigital number, since it uses as much as digits as its factorization.

855901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 855901 is about 925.1491771601. The cubic root of 855901 is about 94.9455274050.

The spelling of 855901 in words is "eight hundred fifty-five thousand, nine hundred one".