285130261 has 8 divisors (see below), whose sum is σ = 307551384. Its totient is φ = 262778880.

The previous prime is 285130243. The next prime is 285130309. The reversal of 285130261 is 162031582.

It can be written as a sum of positive squares in 4 ways, for example, as 124322500 + 160807761 = 11150^2 + 12681^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 285130261 - 2⁷ = 285130133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285130201) 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 7 ways as a sum of consecutive naturals, for example, 8776 + ... + 25441.

It is an arithmetic number, because the mean of its divisors is an integer number (38443923).

Almost surely, 2^285130261 is an apocalyptic number.

It is an amenable number.

285130261 is a deficient number, since it is larger than the sum of its proper divisors (22421123).

285130261 is a wasteful number, since it uses less digits than its factorization.

285130261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34871.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 285130261 is about 16885.8005732627. The cubic root of 285130261 is about 658.1846817640.

The spelling of 285130261 in words is "two hundred eighty-five million, one hundred thirty thousand, two hundred sixty-one".