261006611 has 2 divisors, whose sum is σ = 261006612. Its totient is φ = 261006610.

The previous prime is 261006539. The next prime is 261006637. The reversal of 261006611 is 116600162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261006611 - 2²⁶ = 193897747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261000611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130503305 + 130503306.

It is an arithmetic number, because the mean of its divisors is an integer number (130503306).

Almost surely, 2^261006611 is an apocalyptic number.

261006611 is a deficient number, since it is larger than the sum of its proper divisors (1).

261006611 is an equidigital number, since it uses as much as digits as its factorization.

261006611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 261006611 is about 16155.6990254213. The cubic root of 261006611 is about 639.0730485495.

Adding to 261006611 its reverse (116600162), we get a palindrome (377606773).

The spelling of 261006611 in words is "two hundred sixty-one million, six thousand, six hundred eleven".