855809291 has 16 divisors (see below), whose sum is σ = 931415040. Its totient is φ = 783319680.

The previous prime is 855809167. The next prime is 855809293. The reversal of 855809291 is 192908558.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855809291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855809293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85226 + ... + 94736.

It is an arithmetic number, because the mean of its divisors is an integer number (58213440).

Almost surely, 2^855809291 is an apocalyptic number.

855809291 is a deficient number, since it is larger than the sum of its proper divisors (75605749).

855809291 is a wasteful number, since it uses less digits than its factorization.

855809291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9674.

The product of its (nonzero) digits is 259200, while the sum is 47.

The square root of 855809291 is about 29254.2183453942. The cubic root of 855809291 is about 949.4213617545.

The spelling of 855809291 in words is "eight hundred fifty-five million, eight hundred nine thousand, two hundred ninety-one".