19609643 has 2 divisors, whose sum is σ = 19609644. Its totient is φ = 19609642.

The previous prime is 19609631. The next prime is 19609649. The reversal of 19609643 is 34690691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19609643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19609597 and 19609606.

It is not a weakly prime, because it can be changed into another prime (19609649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9804821 + 9804822.

It is an arithmetic number, because the mean of its divisors is an integer number (9804822).

Almost surely, 2^19609643 is an apocalyptic number.

19609643 is a deficient number, since it is larger than the sum of its proper divisors (1).

19609643 is an equidigital number, since it uses as much as digits as its factorization.

19609643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 19609643 is about 4428.2776561548. The cubic root of 19609643 is about 269.6641594829.

The spelling of 19609643 in words is "nineteen million, six hundred nine thousand, six hundred forty-three".