855245569 has 2 divisors, whose sum is σ = 855245570. Its totient is φ = 855245568.

The previous prime is 855245561. The next prime is 855245591. The reversal of 855245569 is 965542558.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 465696400 + 389549169 = 21580^2 + 19737^2 .

It is a cyclic number.

It is not a de Polignac number, because 855245569 - 2³ = 855245561 is a prime.

It is a super-2 number, since 2×855245569² = 1462889966588267522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (855245561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427622784 + 427622785.

It is an arithmetic number, because the mean of its divisors is an integer number (427622785).

Almost surely, 2^855245569 is an apocalyptic number.

It is an amenable number.

855245569 is a deficient number, since it is larger than the sum of its proper divisors (1).

855245569 is an equidigital number, since it uses as much as digits as its factorization.

855245569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160000, while the sum is 49.

The square root of 855245569 is about 29244.5818742549. The cubic root of 855245569 is about 949.2128545276.

The spelling of 855245569 in words is "eight hundred fifty-five million, two hundred forty-five thousand, five hundred sixty-nine".