19963081 has 2 divisors, whose sum is σ = 19963082. Its totient is φ = 19963080.

The previous prime is 19963079. The next prime is 19963093. The reversal of 19963081 is 18036991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13286025 + 6677056 = 3645^2 + 2584^2 .

It is a cyclic number.

It is not a de Polignac number, because 19963081 - 2¹ = 19963079 is a prime.

It is a super-2 number, since 2×19963081² = 797049206025122, which contains 22 as substring.

Together with 19963079, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19963081.

It is not a weakly prime, because it can be changed into another prime (19963001) 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, 9981540 + 9981541.

It is an arithmetic number, because the mean of its divisors is an integer number (9981541).

Almost surely, 2^19963081 is an apocalyptic number.

It is an amenable number.

19963081 is a deficient number, since it is larger than the sum of its proper divisors (1).

19963081 is an equidigital number, since it uses as much as digits as its factorization.

19963081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 19963081 is about 4468.0063786884. The cubic root of 19963081 is about 271.2746361422.

The spelling of 19963081 in words is "nineteen million, nine hundred sixty-three thousand, eighty-one".