287161 has 4 divisors (see below), whose sum is σ = 328192. Its totient is φ = 246132.

The previous prime is 287159. The next prime is 287167. The reversal of 287161 is 161782.

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 287161 - 2¹ = 287159 is a prime.

It is a super-2 number, since 2×287161² = 164922879842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287167) 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, 20505 + ... + 20518.

It is an arithmetic number, because the mean of its divisors is an integer number (82048).

2²⁸⁷¹⁶¹ is an apocalyptic number.

It is an amenable number.

287161 is a deficient number, since it is larger than the sum of its proper divisors (41031).

287161 is an equidigital number, since it uses as much as digits as its factorization.

287161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41030.

The product of its digits is 672, while the sum is 25.

The square root of 287161 is about 535.8740523668. The cubic root of 287161 is about 65.9743548973.

The spelling of 287161 in words is "two hundred eighty-seven thousand, one hundred sixty-one".