261185134 has 32 divisors (see below), whose sum is σ = 475937280. Its totient is φ = 105004512.

The previous prime is 261185131. The next prime is 261185143. The reversal of 261185134 is 431581162.

It is a junction number, because it is equal to n+sod(n) for n = 261185096 and 261185105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261185131) 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, 22632 + ... + 32164.

It is an arithmetic number, because the mean of its divisors is an integer number (14873040).

Almost surely, 2^261185134 is an apocalyptic number.

261185134 is a deficient number, since it is larger than the sum of its proper divisors (214752146).

261185134 is a wasteful number, since it uses less digits than its factorization.

261185134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9664.

The product of its digits is 5760, while the sum is 31.

The square root of 261185134 is about 16161.2231591548. The cubic root of 261185134 is about 639.2187194909.

The spelling of 261185134 in words is "two hundred sixty-one million, one hundred eighty-five thousand, one hundred thirty-four".