261271134 has 24 divisors (see below), whose sum is σ = 581388600. Its totient is φ = 84736368.

The previous prime is 261271111. The next prime is 261271141. The reversal of 261271134 is 431172162.

261271134 is a `hidden beast` number, since 2 + 612 + 7 + 11 + 34 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261271098 and 261271107.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 195484 + ... + 196815.

It is an arithmetic number, because the mean of its divisors is an integer number (24224525).

Almost surely, 2^261271134 is an apocalyptic number.

261271134 is an abundant number, since it is smaller than the sum of its proper divisors (320117466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261271134 is a wasteful number, since it uses less digits than its factorization.

261271134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392344 (or 392341 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 261271134 is about 16163.8836298706. The cubic root of 261271134 is about 639.2888699579.

It can be divided in two parts, 26127 and 1134, that added together give a triangular number (27261 = T₂₃₃).

The spelling of 261271134 in words is "two hundred sixty-one million, two hundred seventy-one thousand, one hundred thirty-four".