285240961 has 4 divisors (see below), whose sum is σ = 285638400. Its totient is φ = 284843524.

The previous prime is 285240947. The next prime is 285240997. The reversal of 285240961 is 169042582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 285240961 - 2⁵ = 285240929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 285240961.

It is not an unprimeable number, because it can be changed into a prime (285240061) 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, 197641 + ... + 199078.

It is an arithmetic number, because the mean of its divisors is an integer number (71409600).

Almost surely, 2^285240961 is an apocalyptic number.

It is an amenable number.

285240961 is a deficient number, since it is larger than the sum of its proper divisors (397439).

285240961 is an equidigital number, since it uses as much as digits as its factorization.

285240961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397438.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 285240961 is about 16889.0781571997. The cubic root of 285240961 is about 658.2698494072.

The spelling of 285240961 in words is "two hundred eighty-five million, two hundred forty thousand, nine hundred sixty-one".