261475867 has 2 divisors, whose sum is σ = 261475868. Its totient is φ = 261475866.

The previous prime is 261475843. The next prime is 261475873. The reversal of 261475867 is 768574162.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261475867 - 2¹¹ = 261473819 is a prime.

It is not a weakly prime, because it can be changed into another prime (261475897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130737933 + 130737934.

It is an arithmetic number, because the mean of its divisors is an integer number (130737934).

Almost surely, 2^261475867 is an apocalyptic number.

261475867 is a deficient number, since it is larger than the sum of its proper divisors (1).

261475867 is an equidigital number, since it uses as much as digits as its factorization.

261475867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 46.

The square root of 261475867 is about 16170.2154283732. The cubic root of 261475867 is about 639.4558093797.

The spelling of 261475867 in words is "two hundred sixty-one million, four hundred seventy-five thousand, eight hundred sixty-seven".