261336841 has 4 divisors (see below), whose sum is σ = 264273300. Its totient is φ = 258400384.

The previous prime is 261336827. The next prime is 261336857. The reversal of 261336841 is 148633162.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 144696841 + 116640000 = 12029^2 + 10800^2 .

It is a cyclic number.

It is not a de Polignac number, because 261336841 - 2²¹ = 259239689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261336797 and 261336806.

It is not an unprimeable number, because it can be changed into a prime (261336941) 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, 1468096 + ... + 1468273.

It is an arithmetic number, because the mean of its divisors is an integer number (66068325).

Almost surely, 2^261336841 is an apocalyptic number.

It is an amenable number.

261336841 is a deficient number, since it is larger than the sum of its proper divisors (2936459).

261336841 is an equidigital number, since it uses as much as digits as its factorization.

261336841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936458.

The product of its digits is 20736, while the sum is 34.

The square root of 261336841 is about 16165.9160272470. The cubic root of 261336841 is about 639.3424569887.

The spelling of 261336841 in words is "two hundred sixty-one million, three hundred thirty-six thousand, eight hundred forty-one".