2563981889 has 12 divisors (see below), whose sum is σ = 2994980868. Its totient is φ = 2188569600.

The previous prime is 2563981877. The next prime is 2563981919. The reversal of 2563981889 is 9881893652.

It can be written as a sum of positive squares in 2 ways, for example, as 1246654864 + 1317327025 = 35308^2 + 36295^2 .

It is not a de Polignac number, because 2563981889 - 2²⁸ = 2295546433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2563981789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96752 + ... + 120369.

It is an arithmetic number, because the mean of its divisors is an integer number (249581739).

Almost surely, 2^2563981889 is an apocalyptic number.

It is an amenable number.

2563981889 is a deficient number, since it is larger than the sum of its proper divisors (430998979).

2563981889 is a wasteful number, since it uses less digits than its factorization.

2563981889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217376 (or 217369 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 59.

The square root of 2563981889 is about 50635.7767690000. The cubic root of 2563981889 is about 1368.6896539243.

The spelling of 2563981889 in words is "two billion, five hundred sixty-three million, nine hundred eighty-one thousand, eight hundred eighty-nine".