855394391 has 2 divisors, whose sum is σ = 855394392. Its totient is φ = 855394390.

The previous prime is 855394373. The next prime is 855394417. The reversal of 855394391 is 193493558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 855394391 - 2¹⁸ = 855132247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855394361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427697195 + 427697196.

It is an arithmetic number, because the mean of its divisors is an integer number (427697196).

Almost surely, 2^855394391 is an apocalyptic number.

855394391 is a deficient number, since it is larger than the sum of its proper divisors (1).

855394391 is an equidigital number, since it uses as much as digits as its factorization.

855394391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 47.

The square root of 855394391 is about 29247.1262007056. The cubic root of 855394391 is about 949.2679091098.

The spelling of 855394391 in words is "eight hundred fifty-five million, three hundred ninety-four thousand, three hundred ninety-one".