19516963 has 2 divisors, whose sum is σ = 19516964. Its totient is φ = 19516962.

The previous prime is 19516957. The next prime is 19516993. The reversal of 19516963 is 36961591.

It is a weak prime.

It is an emirp because it is prime and its reverse (36961591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19516963 - 2¹³ = 19508771 is a prime.

It is not a weakly prime, because it can be changed into another prime (19516993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9758481 + 9758482.

It is an arithmetic number, because the mean of its divisors is an integer number (9758482).

Almost surely, 2^19516963 is an apocalyptic number.

19516963 is a deficient number, since it is larger than the sum of its proper divisors (1).

19516963 is an equidigital number, since it uses as much as digits as its factorization.

19516963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 40.

The square root of 19516963 is about 4417.8006971795. The cubic root of 19516963 is about 269.2386553650.

The spelling of 19516963 in words is "nineteen million, five hundred sixteen thousand, nine hundred sixty-three".