857142887 has 2 divisors, whose sum is σ = 857142888. Its totient is φ = 857142886.

The previous prime is 857142841. The next prime is 857142899. The reversal of 857142887 is 788241758.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857142887 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 (857147887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428571443 + 428571444.

It is an arithmetic number, because the mean of its divisors is an integer number (428571444).

Almost surely, 2^857142887 is an apocalyptic number.

857142887 is a deficient number, since it is larger than the sum of its proper divisors (1).

857142887 is an equidigital number, since it uses as much as digits as its factorization.

857142887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1003520, while the sum is 50.

The square root of 857142887 is about 29277.0026983638. The cubic root of 857142887 is about 949.9142626226.

The spelling of 857142887 in words is "eight hundred fifty-seven million, one hundred forty-two thousand, eight hundred eighty-seven".