242381 has 4 divisors (see below), whose sum is σ = 244032. Its totient is φ = 240732.

The previous prime is 242377. The next prime is 242393. The reversal of 242381 is 183242.

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: 183242 = 2 ⋅91621.

It is a cyclic number.

It is not a de Polignac number, because 242381 - 2² = 242377 is a prime.

It is a super-2 number, since 2×242381² = 117497098322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242371) 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, 581 + ... + 906.

It is an arithmetic number, because the mean of its divisors is an integer number (61008).

2²⁴²³⁸¹ is an apocalyptic number.

It is an amenable number.

242381 is a deficient number, since it is larger than the sum of its proper divisors (1651).

242381 is a wasteful number, since it uses less digits than its factorization.

242381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650.

The product of its digits is 384, while the sum is 20.

The square root of 242381 is about 492.3220490695. The cubic root of 242381 is about 62.3494831391.

The spelling of 242381 in words is "two hundred forty-two thousand, three hundred eighty-one".