855209659 has 2 divisors, whose sum is σ = 855209660. Its totient is φ = 855209658.

The previous prime is 855209657. The next prime is 855209689. The reversal of 855209659 is 956902558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 855209659 - 2¹ = 855209657 is a prime.

Together with 855209657, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (855209657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427604829 + 427604830.

It is an arithmetic number, because the mean of its divisors is an integer number (427604830).

Almost surely, 2^855209659 is an apocalyptic number.

855209659 is a deficient number, since it is larger than the sum of its proper divisors (1).

855209659 is an equidigital number, since it uses as much as digits as its factorization.

855209659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972000, while the sum is 49.

The square root of 855209659 is about 29243.9679079293. The cubic root of 855209659 is about 949.1995691774.

The spelling of 855209659 in words is "eight hundred fifty-five million, two hundred nine thousand, six hundred fifty-nine".