19816192901 has 2 divisors, whose sum is σ = 19816192902. Its totient is φ = 19816192900.

The previous prime is 19816192871. The next prime is 19816192951. The reversal of 19816192901 is 10929161891.

It is a Cunningham number, because it is equal to 140770²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19816192900 + 1 = 140770^2 + 1^2 .

It is an emirp because it is prime and its reverse (10929161891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19816192901 - 2¹⁴ = 19816176517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19816192951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9908096450 + 9908096451.

It is an arithmetic number, because the mean of its divisors is an integer number (9908096451).

Almost surely, 2^19816192901 is an apocalyptic number.

It is an amenable number.

19816192901 is a deficient number, since it is larger than the sum of its proper divisors (1).

19816192901 is an equidigital number, since it uses as much as digits as its factorization.

19816192901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 47.

The spelling of 19816192901 in words is "nineteen billion, eight hundred sixteen million, one hundred ninety-two thousand, nine hundred one".