261132647 has 2 divisors, whose sum is σ = 261132648. Its totient is φ = 261132646.

The previous prime is 261132587. The next prime is 261132659. The reversal of 261132647 is 746231162.

261132647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261132647 - 2⁶ = 261132583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261132247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130566323 + 130566324.

It is an arithmetic number, because the mean of its divisors is an integer number (130566324).

Almost surely, 2^261132647 is an apocalyptic number.

261132647 is a deficient number, since it is larger than the sum of its proper divisors (1).

261132647 is an equidigital number, since it uses as much as digits as its factorization.

261132647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 261132647 is about 16159.5992215154. The cubic root of 261132647 is about 639.1758981147.

The spelling of 261132647 in words is "two hundred sixty-one million, one hundred thirty-two thousand, six hundred forty-seven".