261260611 has 8 divisors (see below), whose sum is σ = 273296160. Its totient is φ = 249281472.

The previous prime is 261260603. The next prime is 261260689. The reversal of 261260611 is 116062162.

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 261260611 - 2³ = 261260603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261269611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4480 + ... + 23293.

It is an arithmetic number, because the mean of its divisors is an integer number (34162020).

Almost surely, 2^261260611 is an apocalyptic number.

261260611 is a deficient number, since it is larger than the sum of its proper divisors (12035549).

261260611 is a wasteful number, since it uses less digits than its factorization.

261260611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28205.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 261260611 is about 16163.5581169494. The cubic root of 261260611 is about 639.2802871407.

The spelling of 261260611 in words is "two hundred sixty-one million, two hundred sixty thousand, six hundred eleven".