261255243 has 4 divisors (see below), whose sum is σ = 348340328. Its totient is φ = 174170160.

The previous prime is 261255227. The next prime is 261255251. The reversal of 261255243 is 342552162.

261255243 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 not a de Polignac number, because 261255243 - 2⁴ = 261255227 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261255243.

It is not an unprimeable number, because it can be changed into a prime (261255223) 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, 43542538 + ... + 43542543.

It is an arithmetic number, because the mean of its divisors is an integer number (87085082).

Almost surely, 2^261255243 is an apocalyptic number.

261255243 is a deficient number, since it is larger than the sum of its proper divisors (87085085).

261255243 is an equidigital number, since it uses as much as digits as its factorization.

261255243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87085084.

The product of its digits is 14400, while the sum is 30.

The square root of 261255243 is about 16163.3920635490. The cubic root of 261255243 is about 639.2759087794.

The spelling of 261255243 in words is "two hundred sixty-one million, two hundred fifty-five thousand, two hundred forty-three".