285855261 has 4 divisors (see below), whose sum is σ = 381140352. Its totient is φ = 190570172.

The previous prime is 285855253. The next prime is 285855263. The reversal of 285855261 is 162558582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 285855261 - 2³ = 285855253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285855263) 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 3 ways as a sum of consecutive naturals, for example, 47642541 + ... + 47642546.

It is an arithmetic number, because the mean of its divisors is an integer number (95285088).

Almost surely, 2^285855261 is an apocalyptic number.

It is an amenable number.

285855261 is a deficient number, since it is larger than the sum of its proper divisors (95285091).

285855261 is an equidigital number, since it uses as much as digits as its factorization.

285855261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95285090.

The product of its digits is 192000, while the sum is 42.

The square root of 285855261 is about 16907.2546854893. The cubic root of 285855261 is about 658.7420644589.

The spelling of 285855261 in words is "two hundred eighty-five million, eight hundred fifty-five thousand, two hundred sixty-one".