261641239 has 4 divisors (see below), whose sum is σ = 261682720. Its totient is φ = 261599760.

The previous prime is 261641179. The next prime is 261641249. The reversal of 261641239 is 932146162.

It is a happy number.

261641239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 261641239 - 2¹⁹ = 261116951 is a prime.

It is a super-2 number, since 2×261641239² = 136912275890910242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261641249) 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, 9102 + ... + 24619.

It is an arithmetic number, because the mean of its divisors is an integer number (65420680).

Almost surely, 2^261641239 is an apocalyptic number.

261641239 is a deficient number, since it is larger than the sum of its proper divisors (41481).

261641239 is an equidigital number, since it uses as much as digits as its factorization.

261641239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41480.

The product of its digits is 15552, while the sum is 34.

The square root of 261641239 is about 16175.3280955905. The cubic root of 261641239 is about 639.5905902060.

The spelling of 261641239 in words is "two hundred sixty-one million, six hundred forty-one thousand, two hundred thirty-nine".