261285252 has 12 divisors (see below), whose sum is σ = 609665616. Its totient is φ = 87095080.

The previous prime is 261285247. The next prime is 261285259. The reversal of 261285252 is 252582162.

It is a happy number.

261285252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (261285259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10886874 + ... + 10886897.

It is an arithmetic number, because the mean of its divisors is an integer number (50805468).

Almost surely, 2^261285252 is an apocalyptic number.

It is an amenable number.

261285252 is an abundant number, since it is smaller than the sum of its proper divisors (348380364).

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

261285252 is a wasteful number, since it uses less digits than its factorization.

261285252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21773778 (or 21773776 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 261285252 is about 16164.3203383254. The cubic root of 261285252 is about 639.3003845833.

The spelling of 261285252 in words is "two hundred sixty-one million, two hundred eighty-five thousand, two hundred fifty-two".