261102611 has 16 divisors (see below), whose sum is σ = 326439168. Its totient is φ = 202888800.

The previous prime is 261102607. The next prime is 261102613. The reversal of 261102611 is 116201162.

It is a cyclic number.

It is not a de Polignac number, because 261102611 - 2² = 261102607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261102613) 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, 24176 + ... + 33266.

It is an arithmetic number, because the mean of its divisors is an integer number (20402448).

Almost surely, 2^261102611 is an apocalyptic number.

261102611 is a deficient number, since it is larger than the sum of its proper divisors (65336557).

261102611 is a wasteful number, since it uses less digits than its factorization.

261102611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9482.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 261102611 is about 16158.6698400580. The cubic root of 261102611 is about 639.1513907445.

Adding to 261102611 its reverse (116201162), we get a palindrome (377303773).

The spelling of 261102611 in words is "two hundred sixty-one million, one hundred two thousand, six hundred eleven".