285163861 has 4 divisors (see below), whose sum is σ = 286300224. Its totient is φ = 284027500.

The previous prime is 285163817. The next prime is 285163877. The reversal of 285163861 is 168361582.

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 285163861 - 2²⁵ = 251609429 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 (285163811) 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, 567805 + ... + 568306.

It is an arithmetic number, because the mean of its divisors is an integer number (71575056).

Almost surely, 2^285163861 is an apocalyptic number.

It is an amenable number.

285163861 is a deficient number, since it is larger than the sum of its proper divisors (1136363).

285163861 is a wasteful number, since it uses less digits than its factorization.

285163861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136362.

The product of its digits is 69120, while the sum is 40.

The square root of 285163861 is about 16886.7954627277. The cubic root of 285163861 is about 658.2105344352.

The spelling of 285163861 in words is "two hundred eighty-five million, one hundred sixty-three thousand, eight hundred sixty-one".