857309459 has 2 divisors, whose sum is σ = 857309460. Its totient is φ = 857309458.

The previous prime is 857309441. The next prime is 857309461. The reversal of 857309459 is 954903758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 857309459 - 2¹² = 857305363 is a prime.

Together with 857309461, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (857309419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428654729 + 428654730.

It is an arithmetic number, because the mean of its divisors is an integer number (428654730).

Almost surely, 2^857309459 is an apocalyptic number.

857309459 is a deficient number, since it is larger than the sum of its proper divisors (1).

857309459 is an equidigital number, since it uses as much as digits as its factorization.

857309459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The square root of 857309459 is about 29279.8473185910. The cubic root of 857309459 is about 949.9757921809.

The spelling of 857309459 in words is "eight hundred fifty-seven million, three hundred nine thousand, four hundred fifty-nine".