261241611 has 16 divisors (see below), whose sum is σ = 358901280. Its totient is φ = 168945920.

The previous prime is 261241609. The next prime is 261241633. The reversal of 261241611 is 116142162.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 261241611 - 2¹ = 261241609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261241691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4921 + ... + 23381.

It is an arithmetic number, because the mean of its divisors is an integer number (22431330).

Almost surely, 2^261241611 is an apocalyptic number.

261241611 is a deficient number, since it is larger than the sum of its proper divisors (97659669).

261241611 is a wasteful number, since it uses less digits than its factorization.

261241611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18606.

The product of its digits is 576, while the sum is 24.

The square root of 261241611 is about 16162.9703643854. The cubic root of 261241611 is about 639.2647896905.

Adding to 261241611 its reverse (116142162), we get a palindrome (377383773).

The spelling of 261241611 in words is "two hundred sixty-one million, two hundred forty-one thousand, six hundred eleven".