242861 has 4 divisors (see below), whose sum is σ = 244224. Its totient is φ = 241500.

The previous prime is 242819. The next prime is 242863. The reversal of 242861 is 168242.

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, and also an emirpimes, since its reverse is a distinct semiprime: 168242 = 2 ⋅84121.

It is a cyclic number.

It is not a de Polignac number, because 242861 - 2⁶ = 242797 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 242861.

It is not an unprimeable number, because it can be changed into a prime (242863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365 + ... + 786.

It is an arithmetic number, because the mean of its divisors is an integer number (61056).

2²⁴²⁸⁶¹ is an apocalyptic number.

It is an amenable number.

242861 is a deficient number, since it is larger than the sum of its proper divisors (1363).

242861 is a wasteful number, since it uses less digits than its factorization.

242861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362.

The product of its digits is 768, while the sum is 23.

The square root of 242861 is about 492.8092937435. The cubic root of 242861 is about 62.3906140003.

The spelling of 242861 in words is "two hundred forty-two thousand, eight hundred sixty-one".