19650563 has 2 divisors, whose sum is σ = 19650564. Its totient is φ = 19650562.

The previous prime is 19650529. The next prime is 19650619. The reversal of 19650563 is 36505691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19650563 - 2¹⁸ = 19388419 is a prime.

It is a super-2 number, since 2×19650563² = 772289252433938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19650523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9825281 + 9825282.

It is an arithmetic number, because the mean of its divisors is an integer number (9825282).

Almost surely, 2^19650563 is an apocalyptic number.

19650563 is a deficient number, since it is larger than the sum of its proper divisors (1).

19650563 is an equidigital number, since it uses as much as digits as its factorization.

19650563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 19650563 is about 4432.8955548264. The cubic root of 19650563 is about 269.8516011215.

The spelling of 19650563 in words is "nineteen million, six hundred fifty thousand, five hundred sixty-three".