261135047 has 2 divisors, whose sum is σ = 261135048. Its totient is φ = 261135046.

The previous prime is 261135029. The next prime is 261135059. The reversal of 261135047 is 740531162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261135047 - 2⁸ = 261134791 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261131047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130567523 + 130567524.

It is an arithmetic number, because the mean of its divisors is an integer number (130567524).

Almost surely, 2^261135047 is an apocalyptic number.

261135047 is a deficient number, since it is larger than the sum of its proper divisors (1).

261135047 is an equidigital number, since it uses as much as digits as its factorization.

261135047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 261135047 is about 16159.6734806122. The cubic root of 261135047 is about 639.1778562734.

The spelling of 261135047 in words is "two hundred sixty-one million, one hundred thirty-five thousand, forty-seven".