287101 has 4 divisors (see below), whose sum is σ = 292572. Its totient is φ = 281632.

The previous prime is 287099. The next prime is 287107. The reversal of 287101 is 101782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101782 = 2 ⋅50891.

It can be written as a sum of positive squares in 2 ways, for example, as 105625 + 181476 = 325^2 + 426^2 .

It is a cyclic number.

It is not a de Polignac number, because 287101 - 2¹ = 287099 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 (287107) 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, 2656 + ... + 2761.

It is an arithmetic number, because the mean of its divisors is an integer number (73143).

2²⁸⁷¹⁰¹ is an apocalyptic number.

It is an amenable number.

287101 is a deficient number, since it is larger than the sum of its proper divisors (5471).

287101 is an equidigital number, since it uses as much as digits as its factorization.

287101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5470.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 287101 is about 535.8180661381. The cubic root of 287101 is about 65.9697596389.

Adding to 287101 its reverse (101782), we get a palindrome (388883).

The spelling of 287101 in words is "two hundred eighty-seven thousand, one hundred one".