19893974101 has 2 divisors, whose sum is σ = 19893974102. Its totient is φ = 19893974100.

The previous prime is 19893974099. The next prime is 19893974119. The reversal of 19893974101 is 10147939891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17364387076 + 2529587025 = 131774^2 + 50295^2 .

It is an emirp because it is prime and its reverse (10147939891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19893974101 - 2¹ = 19893974099 is a prime.

Together with 19893974099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19893974501) 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 as a sum of consecutive naturals, namely, 9946987050 + 9946987051.

It is an arithmetic number, because the mean of its divisors is an integer number (9946987051).

Almost surely, 2^19893974101 is an apocalyptic number.

It is an amenable number.

19893974101 is a deficient number, since it is larger than the sum of its proper divisors (1).

19893974101 is an equidigital number, since it uses as much as digits as its factorization.

19893974101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 52.

The spelling of 19893974101 in words is "nineteen billion, eight hundred ninety-three million, nine hundred seventy-four thousand, one hundred one".