2303161561 has 4 divisors (see below), whose sum is σ = 2309686452. Its totient is φ = 2296636672.

The previous prime is 2303161559. The next prime is 2303161573. The reversal of 2303161561 is 1651613032.

2303161561 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1114291161 + 1188870400 = 33381^2 + 34480^2 .

It is a cyclic number.

It is not a de Polignac number, because 2303161561 - 2¹ = 2303161559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2303161661) 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, 3261916 + ... + 3262621.

It is an arithmetic number, because the mean of its divisors is an integer number (577421613).

Almost surely, 2^2303161561 is an apocalyptic number.

It is an amenable number.

2303161561 is a deficient number, since it is larger than the sum of its proper divisors (6524891).

2303161561 is an equidigital number, since it uses as much as digits as its factorization.

2303161561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6524890.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 2303161561 is about 47991.2654657074. The cubic root of 2303161561 is about 1320.6106680492.

Adding to 2303161561 its reverse (1651613032), we get a palindrome (3954774593).

The spelling of 2303161561 in words is "two billion, three hundred three million, one hundred sixty-one thousand, five hundred sixty-one".