261239793 has 4 divisors (see below), whose sum is σ = 348319728. Its totient is φ = 174159860.

The previous prime is 261239791. The next prime is 261239843. The reversal of 261239793 is 397932162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261239793 - 2¹ = 261239791 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261239791) 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, 43539963 + ... + 43539968.

It is an arithmetic number, because the mean of its divisors is an integer number (87079932).

Almost surely, 2^261239793 is an apocalyptic number.

It is an amenable number.

261239793 is a deficient number, since it is larger than the sum of its proper divisors (87079935).

261239793 is an equidigital number, since it uses as much as digits as its factorization.

261239793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87079934.

The product of its digits is 122472, while the sum is 42.

The square root of 261239793 is about 16162.9141246249. The cubic root of 261239793 is about 639.2633067899.

The spelling of 261239793 in words is "two hundred sixty-one million, two hundred thirty-nine thousand, seven hundred ninety-three".