19921963 has 2 divisors, whose sum is σ = 19921964. Its totient is φ = 19921962.

The previous prime is 19921939. The next prime is 19921973. The reversal of 19921963 is 36912991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19921963 is a prime.

It is not a weakly prime, because it can be changed into another prime (19921973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9960981 + 9960982.

It is an arithmetic number, because the mean of its divisors is an integer number (9960982).

Almost surely, 2^19921963 is an apocalyptic number.

19921963 is a deficient number, since it is larger than the sum of its proper divisors (1).

19921963 is an equidigital number, since it uses as much as digits as its factorization.

19921963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 40.

The square root of 19921963 is about 4463.4026258002. The cubic root of 19921963 is about 271.0882598104.

The spelling of 19921963 in words is "nineteen million, nine hundred twenty-one thousand, nine hundred sixty-three".