19893974117 has 4 divisors (see below), whose sum is σ = 19916659116. Its totient is φ = 19871289120.

The previous prime is 19893974101. The next prime is 19893974119. The reversal of 19893974117 is 71147939891.

It is a Cunningham number, because it is equal to 141046²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16761445156 + 3132528961 = 129466^2 + 55969^2 .

It is a cyclic number.

It is not a de Polignac number, because 19893974117 - 2⁴ = 19893974101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19893974119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11341184 + ... + 11342937.

It is an arithmetic number, because the mean of its divisors is an integer number (4979164779).

Almost surely, 2^19893974117 is an apocalyptic number.

It is an amenable number.

19893974117 is a deficient number, since it is larger than the sum of its proper divisors (22684999).

19893974117 is an equidigital number, since it uses as much as digits as its factorization.

19893974117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22684998.

The product of its digits is 3429216, while the sum is 59.

The spelling of 19893974117 in words is "nineteen billion, eight hundred ninety-three million, nine hundred seventy-four thousand, one hundred seventeen".