261008611 has 2 divisors, whose sum is σ = 261008612. Its totient is φ = 261008610.

The previous prime is 261008591. The next prime is 261008621. The reversal of 261008611 is 116800162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261008611 - 2¹³ = 261000419 is a prime.

It is a super-2 number, since 2×261008611² = 136250990032298642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261008621) 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 as a sum of consecutive naturals, namely, 130504305 + 130504306.

It is an arithmetic number, because the mean of its divisors is an integer number (130504306).

Almost surely, 2^261008611 is an apocalyptic number.

261008611 is a deficient number, since it is larger than the sum of its proper divisors (1).

261008611 is an equidigital number, since it uses as much as digits as its factorization.

261008611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 261008611 is about 16155.7609229649. The cubic root of 261008611 is about 639.0746808745.

Adding to 261008611 its reverse (116800162), we get a palindrome (377808773).

The spelling of 261008611 in words is "two hundred sixty-one million, eight thousand, six hundred eleven".