2865320561 has 4 divisors (see below), whose sum is σ = 2865463152. Its totient is φ = 2865177972.

The previous prime is 2865320537. The next prime is 2865320597. The reversal of 2865320561 is 1650235682.

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 a de Polignac number, because none of the positive numbers 2^k-2865320561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2865326561) 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, 34991 + ... + 83396.

It is an arithmetic number, because the mean of its divisors is an integer number (716365788).

Almost surely, 2^2865320561 is an apocalyptic number.

It is an amenable number.

2865320561 is a deficient number, since it is larger than the sum of its proper divisors (142591).

2865320561 is a wasteful number, since it uses less digits than its factorization.

2865320561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142590.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 2865320561 is about 53528.6891395633. The cubic root of 2865320561 is about 1420.3359254511.

The spelling of 2865320561 in words is "two billion, eight hundred sixty-five million, three hundred twenty thousand, five hundred sixty-one".