261044159 has 2 divisors, whose sum is σ = 261044160. Its totient is φ = 261044158.

The previous prime is 261044153. The next prime is 261044207. The reversal of 261044159 is 951440162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261044159 - 2⁸ = 261043903 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 (261044153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130522079 + 130522080.

It is an arithmetic number, because the mean of its divisors is an integer number (130522080).

Almost surely, 2^261044159 is an apocalyptic number.

261044159 is a deficient number, since it is larger than the sum of its proper divisors (1).

261044159 is an equidigital number, since it uses as much as digits as its factorization.

261044159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 261044159 is about 16156.8610503402. The cubic root of 261044159 is about 639.1036924275.

The spelling of 261044159 in words is "two hundred sixty-one million, forty-four thousand, one hundred fifty-nine".