2565723231 has 12 divisors (see below), whose sum is σ = 3730919400. Its totient is φ = 1699001520.

The previous prime is 2565723229. The next prime is 2565723241. The reversal of 2565723231 is 1323275652.

2565723231 is a `hidden beast` number, since 2 + 56 + 572 + 3 + 2 + 31 = 666.

It is not a de Polignac number, because 2565723231 - 2¹ = 2565723229 is a prime.

It is a super-2 number, since 2×2565723231² = 13165871396186158722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565723221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 955305 + ... + 957986.

It is an arithmetic number, because the mean of its divisors is an integer number (310909950).

Almost surely, 2^2565723231 is an apocalyptic number.

2565723231 is a deficient number, since it is larger than the sum of its proper divisors (1165196169).

2565723231 is a wasteful number, since it uses less digits than its factorization.

2565723231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913446 (or 1913443 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The square root of 2565723231 is about 50652.9686296865. The cubic root of 2565723231 is about 1368.9994347691. Note that the first 3 decimals are identical.

Adding to 2565723231 its reverse (1323275652), we get a palindrome (3888998883).

The spelling of 2565723231 in words is "two billion, five hundred sixty-five million, seven hundred twenty-three thousand, two hundred thirty-one".