242751 has 4 divisors (see below), whose sum is σ = 323672. Its totient is φ = 161832.

The previous prime is 242747. The next prime is 242773. The reversal of 242751 is 157242.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 242751 - 2² = 242747 is a prime.

It is a D-number.

It is a Duffinian number.

242751 is a lucky number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242731) 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, 40456 + ... + 40461.

It is an arithmetic number, because the mean of its divisors is an integer number (80918).

2²⁴²⁷⁵¹ is an apocalyptic number.

242751 is a deficient number, since it is larger than the sum of its proper divisors (80921).

242751 is an equidigital number, since it uses as much as digits as its factorization.

242751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80920.

The product of its digits is 560, while the sum is 21.

The square root of 242751 is about 492.6976760652. The cubic root of 242751 is about 62.3811929680.

Adding to 242751 its reverse (157242), we get a palindrome (399993).

It can be divided in two parts, 24 and 2751, that added together give a triangular number (2775 = T₇₄).

The spelling of 242751 in words is "two hundred forty-two thousand, seven hundred fifty-one".