2561432305 has 4 divisors (see below), whose sum is σ = 3073718772. Its totient is φ = 2049145840.

The previous prime is 2561432267. The next prime is 2561432353. The reversal of 2561432305 is 5032341652.

It is a happy number.

2561432305 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 961992256 + 1599440049 = 31016^2 + 39993^2 .

It is not a de Polignac number, because 2561432305 - 2¹¹ = 2561430257 is a prime.

It is a super-2 number, since 2×2561432305² = 13121870906195226050, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256143226 + ... + 256143235.

It is an arithmetic number, because the mean of its divisors is an integer number (768429693).

Almost surely, 2^2561432305 is an apocalyptic number.

It is an amenable number.

2561432305 is a deficient number, since it is larger than the sum of its proper divisors (512286467).

2561432305 is an equidigital number, since it uses as much as digits as its factorization.

2561432305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512286466.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 2561432305 is about 50610.5947900240. The cubic root of 2561432305 is about 1368.2358355151.

Adding to 2561432305 its reverse (5032341652), we get a palindrome (7593773957).

The spelling of 2561432305 in words is "two billion, five hundred sixty-one million, four hundred thirty-two thousand, three hundred five".