261035161 has 2 divisors, whose sum is σ = 261035162. Its totient is φ = 261035160.

The previous prime is 261035077. The next prime is 261035191. The reversal of 261035161 is 161530162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 258212761 + 2822400 = 16069^2 + 1680^2 .

It is a cyclic number.

It is not a de Polignac number, because 261035161 - 2¹⁵ = 261002393 is a prime.

It is not a weakly prime, because it can be changed into another prime (261035191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130517580 + 130517581.

It is an arithmetic number, because the mean of its divisors is an integer number (130517581).

Almost surely, 2^261035161 is an apocalyptic number.

It is an amenable number.

261035161 is a deficient number, since it is larger than the sum of its proper divisors (1).

261035161 is an equidigital number, since it uses as much as digits as its factorization.

261035161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 261035161 is about 16156.5825903871. The cubic root of 261035161 is about 639.0963491985.

The spelling of 261035161 in words is "two hundred sixty-one million, thirty-five thousand, one hundred sixty-one".