261042193 has 2 divisors, whose sum is σ = 261042194. Its totient is φ = 261042192.

The previous prime is 261042169. The next prime is 261042263. The reversal of 261042193 is 391240162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167107329 + 93934864 = 12927^2 + 9692^2 .

It is a cyclic number.

It is not a de Polignac number, because 261042193 - 2⁵ = 261042161 is a prime.

It is not a weakly prime, because it can be changed into another prime (261042163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130521096 + 130521097.

It is an arithmetic number, because the mean of its divisors is an integer number (130521097).

Almost surely, 2^261042193 is an apocalyptic number.

It is an amenable number.

261042193 is a deficient number, since it is larger than the sum of its proper divisors (1).

261042193 is an equidigital number, since it uses as much as digits as its factorization.

261042193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 261042193 is about 16156.8002091998. The cubic root of 261042193 is about 639.1020879978.

The spelling of 261042193 in words is "two hundred sixty-one million, forty-two thousand, one hundred ninety-three".