285456891 has 4 divisors (see below), whose sum is σ = 380609192. Its totient is φ = 190304592.

The previous prime is 285456869. The next prime is 285456907. The reversal of 285456891 is 198654582.

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

It is not a de Polignac number, because 285456891 - 2¹¹ = 285454843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 285456891.

It is not an unprimeable number, because it can be changed into a prime (285456811) 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, 47576146 + ... + 47576151.

It is an arithmetic number, because the mean of its divisors is an integer number (95152298).

Almost surely, 2^285456891 is an apocalyptic number.

285456891 is a deficient number, since it is larger than the sum of its proper divisors (95152301).

285456891 is an equidigital number, since it uses as much as digits as its factorization.

285456891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95152300.

The product of its digits is 691200, while the sum is 48.

The square root of 285456891 is about 16895.4695406786. The cubic root of 285456891 is about 658.4359129300.

The spelling of 285456891 in words is "two hundred eighty-five million, four hundred fifty-six thousand, eight hundred ninety-one".