287081 has 4 divisors (see below), whose sum is σ = 289872. Its totient is φ = 284292.

The previous prime is 287059. The next prime is 287087. The reversal of 287081 is 180782.

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 a de Polignac number, because none of the positive numbers 2^k-287081 is a prime.

It is a super-2 number, since 2×287081² = 164831001122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 287081.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287081.

It is not an unprimeable number, because it can be changed into a prime (287087) 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, 1235 + ... + 1448.

It is an arithmetic number, because the mean of its divisors is an integer number (72468).

2²⁸⁷⁰⁸¹ is an apocalyptic number.

It is an amenable number.

287081 is a deficient number, since it is larger than the sum of its proper divisors (2791).

287081 is a wasteful number, since it uses less digits than its factorization.

287081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 287081 is about 535.7994027619. The cubic root of 287081 is about 65.9682277438.

The spelling of 287081 in words is "two hundred eighty-seven thousand, eighty-one".