261075285 has 16 divisors (see below), whose sum is σ = 464134080. Its totient is φ = 139240080.

The previous prime is 261075253. The next prime is 261075289. The reversal of 261075285 is 582570162.

It is a happy number.

261075285 is a `hidden beast` number, since 26 + 107 + 528 + 5 = 666.

It is not a de Polignac number, because 261075285 - 2⁵ = 261075253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261075289) 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, 966811 + ... + 967080.

It is an arithmetic number, because the mean of its divisors is an integer number (29008380).

Almost surely, 2^261075285 is an apocalyptic number.

It is an amenable number.

261075285 is a deficient number, since it is larger than the sum of its proper divisors (203058795).

261075285 is a wasteful number, since it uses less digits than its factorization.

261075285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933905 (or 1933899 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 261075285 is about 16157.8242656615. The cubic root of 261075285 is about 639.1290929204.

It can be divided in two parts, 26 and 1075285, that added together give a triangular number (1075311 = T₁₄₆₆).

The spelling of 261075285 in words is "two hundred sixty-one million, seventy-five thousand, two hundred eighty-five".