2563981919 has 2 divisors, whose sum is σ = 2563981920. Its totient is φ = 2563981918.

The previous prime is 2563981877. The next prime is 2563981991. The reversal of 2563981919 is 9191893652.

It is a happy number.

2563981919 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (2563981991) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2563981919 - 2⁸ = 2563981663 is a prime.

It is a super-2 number, since 2×2563981919² = 13148006561917845122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2563981019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1281990959 + 1281990960.

It is an arithmetic number, because the mean of its divisors is an integer number (1281990960).

Almost surely, 2^2563981919 is an apocalyptic number.

2563981919 is a deficient number, since it is larger than the sum of its proper divisors (1).

2563981919 is an equidigital number, since it uses as much as digits as its factorization.

2563981919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 53.

The square root of 2563981919 is about 50635.7770652332. Note that the first 3 decimals coincide. The cubic root of 2563981919 is about 1368.6896592625.

The spelling of 2563981919 in words is "two billion, five hundred sixty-three million, nine hundred eighty-one thousand, nine hundred nineteen".