261703417 has 4 divisors (see below), whose sum is σ = 261743860. Its totient is φ = 261662976.

The previous prime is 261703363. The next prime is 261703459. The reversal of 261703417 is 714307162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 98783721 + 162919696 = 9939^2 + 12764^2 .

It is a 3-Lehmer number, since φ(261703417) divides (261703417-1)³.

It is a cyclic number.

It is not a de Polignac number, because 261703417 - 2¹¹ = 261701369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261703817) 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 in 3 ways as a sum of consecutive naturals, for example, 8088 + ... + 24265.

It is an arithmetic number, because the mean of its divisors is an integer number (65435965).

It is a Poulet number, since it divides 2^261703416-1.

Almost surely, 2^261703417 is an apocalyptic number.

261703417 is the 8089-th decagonal number.

It is an amenable number.

261703417 is a deficient number, since it is larger than the sum of its proper divisors (40443).

261703417 is an equidigital number, since it uses as much as digits as its factorization.

261703417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40442.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 261703417 is about 16177.2499826145. The cubic root of 261703417 is about 639.6412515799.

The spelling of 261703417 in words is "two hundred sixty-one million, seven hundred three thousand, four hundred seventeen".