239121 has 9 divisors (see below), whose sum is σ = 347529. Its totient is φ = 158436.

The previous prime is 239119. The next prime is 239137. The reversal of 239121 is 121932.

239121 = T₄₈₈ + T₄₈₉.

It is a happy number.

The square root of 239121 is 489.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 239121 - 2¹ = 239119 is a prime.

It is a Curzon number.

239121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 239094 and 239103.

It is not an unprimeable number, because it can be changed into a prime (239171) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1386 + ... + 1548.

239121 is a Friedman number, since it can be written as ((1+1)^9-23)^2, using all its digits and the basic arithmetic operations.

2²³⁹¹²¹ is an apocalyptic number.

239121 is the 489-th square number.

239121 is the 245-th centered octagonal number.

It is an amenable number.

239121 is a deficient number, since it is larger than the sum of its proper divisors (108408).

239121 is an equidigital number, since it uses as much as digits as its factorization.

239121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 166 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The cubic root of 239121 is about 62.0686890473.

The spelling of 239121 in words is "two hundred thirty-nine thousand, one hundred twenty-one".