261813041 has 8 divisors (see below), whose sum is σ = 299316864. Its totient is φ = 224334720.

The previous prime is 261813023. The next prime is 261813047. The reversal of 261813041 is 140318162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261813041 - 2²² = 257618737 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261813041.

It is not an unprimeable number, because it can be changed into a prime (261813047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28001 + ... + 36161.

It is an arithmetic number, because the mean of its divisors is an integer number (37414608).

Almost surely, 2^261813041 is an apocalyptic number.

It is an amenable number.

261813041 is a deficient number, since it is larger than the sum of its proper divisors (37503823).

261813041 is an equidigital number, since it uses as much as digits as its factorization.

261813041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12751.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 261813041 is about 16180.6378428046. The cubic root of 261813041 is about 639.7305514508.

The spelling of 261813041 in words is "two hundred sixty-one million, eight hundred thirteen thousand, forty-one".