19568641 has 2 divisors, whose sum is σ = 19568642. Its totient is φ = 19568640.

The previous prime is 19568621. The next prime is 19568663. The reversal of 19568641 is 14686591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18455616 + 1113025 = 4296^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 19568641 - 2⁵ = 19568609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19568594 and 19568603.

It is not a weakly prime, because it can be changed into another prime (19568611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9784320 + 9784321.

It is an arithmetic number, because the mean of its divisors is an integer number (9784321).

Almost surely, 2^19568641 is an apocalyptic number.

It is an amenable number.

19568641 is a deficient number, since it is larger than the sum of its proper divisors (1).

19568641 is an equidigital number, since it uses as much as digits as its factorization.

19568641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 19568641 is about 4423.6456684504. The cubic root of 19568641 is about 269.4760805011.

The spelling of 19568641 in words is "nineteen million, five hundred sixty-eight thousand, six hundred forty-one".