2561969439 has 32 divisors (see below), whose sum is σ = 3871627200. Its totient is φ = 1673930880.

The previous prime is 2561969401. The next prime is 2561969507. The reversal of 2561969439 is 9349691652.

2561969439 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2561969439 - 2²³ = 2553580831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561961439) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 479917 + ... + 485225.

It is an arithmetic number, because the mean of its divisors is an integer number (120988350).

Almost surely, 2^2561969439 is an apocalyptic number.

2561969439 is a deficient number, since it is larger than the sum of its proper divisors (1309657761).

2561969439 is a wasteful number, since it uses less digits than its factorization.

2561969439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5672 (or 5666 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 54.

The square root of 2561969439 is about 50615.9010489787. The cubic root of 2561969439 is about 1368.3314688085.

The spelling of 2561969439 in words is "two billion, five hundred sixty-one million, nine hundred sixty-nine thousand, four hundred thirty-nine".