19736641 has 2 divisors, whose sum is σ = 19736642. Its totient is φ = 19736640.

The previous prime is 19736593. The next prime is 19736657. The reversal of 19736641 is 14663791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13660416 + 6076225 = 3696^2 + 2465^2 .

It is a cyclic number.

It is not a de Polignac number, because 19736641 - 2¹⁹ = 19212353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19736641.

It is not a weakly prime, because it can be changed into another prime (19736671) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9868320 + 9868321.

It is an arithmetic number, because the mean of its divisors is an integer number (9868321).

Almost surely, 2^19736641 is an apocalyptic number.

It is an amenable number.

19736641 is a deficient number, since it is larger than the sum of its proper divisors (1).

19736641 is an equidigital number, since it uses as much as digits as its factorization.

19736641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 19736641 is about 4442.5939494849. The cubic root of 19736641 is about 270.2450495901.

The spelling of 19736641 in words is "nineteen million, seven hundred thirty-six thousand, six hundred forty-one".