855607391 has 2 divisors, whose sum is σ = 855607392. Its totient is φ = 855607390.

The previous prime is 855607349. The next prime is 855607447. The reversal of 855607391 is 193706558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 855607391 - 2⁶ = 855607327 is a prime.

It is a Sophie Germain 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 (855607591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427803695 + 427803696.

It is an arithmetic number, because the mean of its divisors is an integer number (427803696).

Almost surely, 2^855607391 is an apocalyptic number.

855607391 is a deficient number, since it is larger than the sum of its proper divisors (1).

855607391 is an equidigital number, since it uses as much as digits as its factorization.

855607391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 855607391 is about 29250.7673574558. The cubic root of 855607391 is about 949.3466943214.

The spelling of 855607391 in words is "eight hundred fifty-five million, six hundred seven thousand, three hundred ninety-one".