261210611 has 2 divisors, whose sum is σ = 261210612. Its totient is φ = 261210610.

The previous prime is 261210581. The next prime is 261210617. The reversal of 261210611 is 116012162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261210611 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261210617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130605305 + 130605306.

It is an arithmetic number, because the mean of its divisors is an integer number (130605306).

Almost surely, 2^261210611 is an apocalyptic number.

261210611 is a deficient number, since it is larger than the sum of its proper divisors (1).

261210611 is an equidigital number, since it uses as much as digits as its factorization.

261210611 is an evil number, because the sum of its binary digits is even.

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

The square root of 261210611 is about 16162.0113537889. The cubic root of 261210611 is about 639.2395027639.

Adding to 261210611 its reverse (116012162), we get a palindrome (377222773).

The spelling of 261210611 in words is "two hundred sixty-one million, two hundred ten thousand, six hundred eleven".