857057189 has 2 divisors, whose sum is σ = 857057190. Its totient is φ = 857057188.

The previous prime is 857057167. The next prime is 857057197. The reversal of 857057189 is 981750758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625500100 + 231557089 = 25010^2 + 15217^2 .

It is a cyclic number.

It is not a de Polignac number, because 857057189 - 2⁸ = 857056933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857047189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428528594 + 428528595.

It is an arithmetic number, because the mean of its divisors is an integer number (428528595).

Almost surely, 2^857057189 is an apocalyptic number.

It is an amenable number.

857057189 is a deficient number, since it is larger than the sum of its proper divisors (1).

857057189 is an equidigital number, since it uses as much as digits as its factorization.

857057189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 705600, while the sum is 50.

The square root of 857057189 is about 29275.5390898272. The cubic root of 857057189 is about 949.8826037759.

The spelling of 857057189 in words is "eight hundred fifty-seven million, fifty-seven thousand, one hundred eighty-nine".