2563981789 has 2 divisors, whose sum is σ = 2563981790. Its totient is φ = 2563981788.

The previous prime is 2563981757. The next prime is 2563981793. The reversal of 2563981789 is 9871893652.

2563981789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2486717689 + 77264100 = 49867^2 + 8790^2 .

It is a cyclic number.

It is not a de Polignac number, because 2563981789 - 2⁵ = 2563981757 is a prime.

It is a super-2 number, since 2×2563981789² = 13148005228647281042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2563981729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1281990894 + 1281990895.

It is an arithmetic number, because the mean of its divisors is an integer number (1281990895).

Almost surely, 2^2563981789 is an apocalyptic number.

It is an amenable number.

2563981789 is a deficient number, since it is larger than the sum of its proper divisors (1).

2563981789 is an equidigital number, since it uses as much as digits as its factorization.

2563981789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 58.

The square root of 2563981789 is about 50635.7757815559. The cubic root of 2563981789 is about 1368.6896361305.

The spelling of 2563981789 in words is "two billion, five hundred sixty-three million, nine hundred eighty-one thousand, seven hundred eighty-nine".