857569423 has 2 divisors, whose sum is σ = 857569424. Its totient is φ = 857569422.

The previous prime is 857569397. The next prime is 857569429. The reversal of 857569423 is 324965758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 857569423 - 2⁹ = 857568911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857569429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428784711 + 428784712.

It is an arithmetic number, because the mean of its divisors is an integer number (428784712).

Almost surely, 2^857569423 is an apocalyptic number.

857569423 is a deficient number, since it is larger than the sum of its proper divisors (1).

857569423 is an equidigital number, since it uses as much as digits as its factorization.

857569423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 49.

The square root of 857569423 is about 29284.2862812123. The cubic root of 857569423 is about 950.0718036217.

The spelling of 857569423 in words is "eight hundred fifty-seven million, five hundred sixty-nine thousand, four hundred twenty-three".