242731 has 2 divisors, whose sum is σ = 242732. Its totient is φ = 242730.

The previous prime is 242729. The next prime is 242747. The reversal of 242731 is 137242.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 242731 - 2¹ = 242729 is a prime.

It is a super-2 number, since 2×242731² = 117836676722, which contains 22 as substring.

Together with 242729, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2³ + 4⁸ + 7 + 2⁵ + 3¹¹ + 1 .

It is a junction number, because it is equal to n+sod(n) for n = 242699 and 242708.

It is not a weakly prime, because it can be changed into another prime (246731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121365 + 121366.

It is an arithmetic number, because the mean of its divisors is an integer number (121366).

2²⁴²⁷³¹ is an apocalyptic number.

242731 is a deficient number, since it is larger than the sum of its proper divisors (1).

242731 is an equidigital number, since it uses as much as digits as its factorization.

242731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 19.

The square root of 242731 is about 492.6773792250. The cubic root of 242731 is about 62.3794797473.

Adding to 242731 its reverse (137242), we get a palindrome (379973).

The spelling of 242731 in words is "two hundred forty-two thousand, seven hundred thirty-one".