855622309 has 4 divisors (see below), whose sum is σ = 856128204. Its totient is φ = 855116416.

The previous prime is 855622303. The next prime is 855622319. The reversal of 855622309 is 903226558.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 502746084 + 352876225 = 22422^2 + 18785^2 .

It is a cyclic number.

It is not a de Polignac number, because 855622309 - 2⁹ = 855621797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855622303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250402 + ... + 253795.

It is an arithmetic number, because the mean of its divisors is an integer number (214032051).

Almost surely, 2^855622309 is an apocalyptic number.

It is an amenable number.

855622309 is a deficient number, since it is larger than the sum of its proper divisors (505895).

855622309 is a wasteful number, since it uses less digits than its factorization.

855622309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505894.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 855622309 is about 29251.0223582014. The cubic root of 855622309 is about 949.3522117553.

The spelling of 855622309 in words is "eight hundred fifty-five million, six hundred twenty-two thousand, three hundred nine".