242109 has 30 divisors (see below), whose sum is σ = 427614. Its totient is φ = 136080.

The previous prime is 242101. The next prime is 242119. The reversal of 242109 is 901242.

It can be written as a sum of positive squares in only one way, i.e., 142884 + 99225 = 378^2 + 315^2 .

It is not a de Polignac number, because 242109 - 2³ = 242101 is a prime.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 242091 and 242100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242101) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 3939 + ... + 3999.

2²⁴²¹⁰⁹ is an apocalyptic number.

It is an amenable number.

242109 is a deficient number, since it is larger than the sum of its proper divisors (185505).

242109 is an equidigital number, since it uses as much as digits as its factorization.

242109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 242109 is about 492.0457295821. The cubic root of 242109 is about 62.3261515425.

It can be divided in two parts, 242 and 109, that added together give a triangular number (351 = T₂₆).

The spelling of 242109 in words is "two hundred forty-two thousand, one hundred nine".