2568242981 has 2 divisors, whose sum is σ = 2568242982. Its totient is φ = 2568242980.

The previous prime is 2568242959. The next prime is 2568243011. The reversal of 2568242981 is 1892428652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1291324225 + 1276918756 = 35935^2 + 35734^2 .

It is a cyclic number.

It is not a de Polignac number, because 2568242981 - 2¹⁰ = 2568241957 is a prime.

It is a super-2 number, since 2×2568242981² = 13191744018911532722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2568242081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1284121490 + 1284121491.

It is an arithmetic number, because the mean of its divisors is an integer number (1284121491).

Almost surely, 2^2568242981 is an apocalyptic number.

It is an amenable number.

2568242981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2568242981 is an equidigital number, since it uses as much as digits as its factorization.

2568242981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 47.

The square root of 2568242981 is about 50677.8352043573. The cubic root of 2568242981 is about 1369.4474446008.

The spelling of 2568242981 in words is "two billion, five hundred sixty-eight million, two hundred forty-two thousand, nine hundred eighty-one".