19914381089 has 2 divisors, whose sum is σ = 19914381090. Its totient is φ = 19914381088.

The previous prime is 19914381073. The next prime is 19914381161. The reversal of 19914381089 is 98018341991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19865493025 + 48888064 = 140945^2 + 6992^2 .

It is a cyclic number.

It is not a de Polignac number, because 19914381089 - 2⁴ = 19914381073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19914381089.

It is not a weakly prime, because it can be changed into another prime (19914381049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9957190544 + 9957190545.

It is an arithmetic number, because the mean of its divisors is an integer number (9957190545).

Almost surely, 2^19914381089 is an apocalyptic number.

It is an amenable number.

19914381089 is a deficient number, since it is larger than the sum of its proper divisors (1).

19914381089 is an equidigital number, since it uses as much as digits as its factorization.

19914381089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 53.

The spelling of 19914381089 in words is "nineteen billion, nine hundred fourteen million, three hundred eighty-one thousand, eighty-nine".