261604113 has 16 divisors (see below), whose sum is σ = 354845760. Its totient is φ = 171395136.

The previous prime is 261604073. The next prime is 261604121. The reversal of 261604113 is 311406162.

It is not a de Polignac number, because 261604113 - 2⁸ = 261603857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261604163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101031 + ... + 103587.

It is an arithmetic number, because the mean of its divisors is an integer number (22177860).

Almost surely, 2^261604113 is an apocalyptic number.

It is an amenable number.

261604113 is a deficient number, since it is larger than the sum of its proper divisors (93241647).

261604113 is a wasteful number, since it uses less digits than its factorization.

261604113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3136.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 261604113 is about 16174.1804429158. The cubic root of 261604113 is about 639.5603368668.

The spelling of 261604113 in words is "two hundred sixty-one million, six hundred four thousand, one hundred thirteen".