855285291 has 64 divisors (see below), whose sum is σ = 1522237440. Its totient is φ = 464032800.

The previous prime is 855285269. The next prime is 855285311. The reversal of 855285291 is 192582558.

It is a happy number.

855285291 is a `hidden beast` number, since 8 + 552 + 8 + 5 + 2 + 91 = 666.

It is not a de Polignac number, because 855285291 - 2¹⁵ = 855252523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855285491) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 655746 + ... + 657048.

It is an arithmetic number, because the mean of its divisors is an integer number (23784960).

Almost surely, 2^855285291 is an apocalyptic number.

855285291 is a deficient number, since it is larger than the sum of its proper divisors (666952149).

855285291 is a wasteful number, since it uses less digits than its factorization.

855285291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493 (or 1487 counting only the distinct ones).

The product of its digits is 288000, while the sum is 45.

The square root of 855285291 is about 29245.2610007160. The cubic root of 855285291 is about 949.2275497413.

It can be divided in two parts, 855 and 285291, that added together give a triangular number (286146 = T₇₅₆).

The spelling of 855285291 in words is "eight hundred fifty-five million, two hundred eighty-five thousand, two hundred ninety-one".