19193002009 has 2 divisors, whose sum is σ = 19193002010. Its totient is φ = 19193002008.

The previous prime is 19193002001. The next prime is 19193002033. The reversal of 19193002009 is 90020039191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17628403984 + 1564598025 = 132772^2 + 39555^2 .

It is a cyclic number.

It is not a de Polignac number, because 19193002009 - 2³ = 19193002001 is a prime.

It is a super-2 number, since 2×19193002009² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19193002001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9596501004 + 9596501005.

It is an arithmetic number, because the mean of its divisors is an integer number (9596501005).

Almost surely, 2^19193002009 is an apocalyptic number.

It is an amenable number.

19193002009 is a deficient number, since it is larger than the sum of its proper divisors (1).

19193002009 is an equidigital number, since it uses as much as digits as its factorization.

19193002009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 34.

The spelling of 19193002009 in words is "nineteen billion, one hundred ninety-three million, two thousand, nine".