2568389491 has 2 divisors, whose sum is σ = 2568389492. Its totient is φ = 2568389490.

The previous prime is 2568389489. The next prime is 2568389497. The reversal of 2568389491 is 1949838652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2568389491 - 2¹ = 2568389489 is a prime.

Together with 2568389489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2568389497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1284194745 + 1284194746.

It is an arithmetic number, because the mean of its divisors is an integer number (1284194746).

Almost surely, 2^2568389491 is an apocalyptic number.

2568389491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2568389491 is an equidigital number, since it uses as much as digits as its factorization.

2568389491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 55.

The square root of 2568389491 is about 50679.2806874762. The cubic root of 2568389491 is about 1369.4734849627.

The spelling of 2568389491 in words is "two billion, five hundred sixty-eight million, three hundred eighty-nine thousand, four hundred ninety-one".