261047671 has 2 divisors, whose sum is σ = 261047672. Its totient is φ = 261047670.

The previous prime is 261047663. The next prime is 261047687. The reversal of 261047671 is 176740162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261047671 - 2³ = 261047663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261047651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130523835 + 130523836.

It is an arithmetic number, because the mean of its divisors is an integer number (130523836).

Almost surely, 2^261047671 is an apocalyptic number.

261047671 is a deficient number, since it is larger than the sum of its proper divisors (1).

261047671 is an equidigital number, since it uses as much as digits as its factorization.

261047671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 261047671 is about 16156.9697344521. The cubic root of 261047671 is about 639.1065585098.

The spelling of 261047671 in words is "two hundred sixty-one million, forty-seven thousand, six hundred seventy-one".