261613201 has 16 divisors (see below), whose sum is σ = 278910720. Its totient is φ = 244854720.

The previous prime is 261613133. The next prime is 261613229. The reversal of 261613201 is 102316162.

It is a cyclic number.

It is not a de Polignac number, because 261613201 - 2⁷ = 261613073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261613241) 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 15 ways as a sum of consecutive naturals, for example, 368635 + ... + 369343.

It is an arithmetic number, because the mean of its divisors is an integer number (17431920).

Almost surely, 2^261613201 is an apocalyptic number.

It is an amenable number.

261613201 is a deficient number, since it is larger than the sum of its proper divisors (17297519).

261613201 is a wasteful number, since it uses less digits than its factorization.

261613201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 261613201 is about 16174.4613820677. The cubic root of 261613201 is about 639.5677427864.

Adding to 261613201 its reverse (102316162), we get a palindrome (363929363).

The spelling of 261613201 in words is "two hundred sixty-one million, six hundred thirteen thousand, two hundred one".