857223187 has 2 divisors, whose sum is σ = 857223188. Its totient is φ = 857223186.

The previous prime is 857223173. The next prime is 857223229. The reversal of 857223187 is 781322758.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 857223187 - 2²³ = 848834579 is a prime.

It is not a weakly prime, because it can be changed into another prime (857223137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428611593 + 428611594.

It is an arithmetic number, because the mean of its divisors is an integer number (428611594).

Almost surely, 2^857223187 is an apocalyptic number.

857223187 is a deficient number, since it is larger than the sum of its proper divisors (1).

857223187 is an equidigital number, since it uses as much as digits as its factorization.

857223187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 43.

The square root of 857223187 is about 29278.3740498000. The cubic root of 857223187 is about 949.9439254067.

The spelling of 857223187 in words is "eight hundred fifty-seven million, two hundred twenty-three thousand, one hundred eighty-seven".