2561256231 has 4 divisors (see below), whose sum is σ = 3415008312. Its totient is φ = 1707504152.

The previous prime is 2561256223. The next prime is 2561256251. The reversal of 2561256231 is 1326521652.

2561256231 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 is a cyclic number.

It is not a de Polignac number, because 2561256231 - 2³ = 2561256223 is a prime.

It is a super-2 number, since 2×2561256231² = 13120066961672650722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2561256192 and 2561256201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561256251) 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, 426876036 + ... + 426876041.

It is an arithmetic number, because the mean of its divisors is an integer number (853752078).

Almost surely, 2^2561256231 is an apocalyptic number.

2561256231 is a deficient number, since it is larger than the sum of its proper divisors (853752081).

2561256231 is an equidigital number, since it uses as much as digits as its factorization.

2561256231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853752080.

The product of its digits is 21600, while the sum is 33.

The square root of 2561256231 is about 50608.8552626909. The cubic root of 2561256231 is about 1368.2044837493.

Adding to 2561256231 its reverse (1326521652), we get a palindrome (3887777883).

The spelling of 2561256231 in words is "two billion, five hundred sixty-one million, two hundred fifty-six thousand, two hundred thirty-one".