2303321561 has 4 divisors (see below), whose sum is σ = 2303419572. Its totient is φ = 2303223552.

The previous prime is 2303321543. The next prime is 2303321563. The reversal of 2303321561 is 1651233032.

2303321561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1295640025 + 1007681536 = 35995^2 + 31744^2 .

It is a cyclic number.

It is not a de Polignac number, because 2303321561 - 2⁶ = 2303321497 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 2303321561.

It is not an unprimeable number, because it can be changed into a prime (2303321563) 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, 9641 + ... + 68553.

It is an arithmetic number, because the mean of its divisors is an integer number (575854893).

Almost surely, 2^2303321561 is an apocalyptic number.

It is an amenable number.

2303321561 is a deficient number, since it is larger than the sum of its proper divisors (98011).

2303321561 is an equidigital number, since it uses as much as digits as its factorization.

2303321561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98010.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 2303321561 is about 47992.9324067617. The cubic root of 2303321561 is about 1320.6412481611.

Adding to 2303321561 its reverse (1651233032), we get a palindrome (3954554593).

The spelling of 2303321561 in words is "two billion, three hundred three million, three hundred twenty-one thousand, five hundred sixty-one".