239891121 has 6 divisors (see below), whose sum is σ = 346509410. Its totient is φ = 159927408.

The previous prime is 239891107. The next prime is 239891129. The reversal of 239891121 is 121198932.

239891121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 143065521 + 96825600 = 11961^2 + 9840^2 .

It is not a de Polignac number, because 239891121 - 2⁷ = 239890993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (239891129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13327276 + ... + 13327293.

Almost surely, 2^239891121 is an apocalyptic number.

It is an amenable number.

239891121 is a deficient number, since it is larger than the sum of its proper divisors (106618289).

239891121 is a wasteful number, since it uses less digits than its factorization.

239891121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26654575 (or 26654572 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 239891121 is about 15488.4189315759. The cubic root of 239891121 is about 621.3525113183.

It can be divided in two parts, 2398911 and 21, that added together give a palindrome (2398932).

The spelling of 239891121 in words is "two hundred thirty-nine million, eight hundred ninety-one thousand, one hundred twenty-one".