19930111 has 2 divisors, whose sum is σ = 19930112. Its totient is φ = 19930110.

The previous prime is 19930109. The next prime is 19930129. The reversal of 19930111 is 11103991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19930111 - 2¹ = 19930109 is a prime.

Together with 19930109, 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 (19931111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9965055 + 9965056.

It is an arithmetic number, because the mean of its divisors is an integer number (9965056).

Almost surely, 2^19930111 is an apocalyptic number.

19930111 is a deficient number, since it is larger than the sum of its proper divisors (1).

19930111 is an equidigital number, since it uses as much as digits as its factorization.

19930111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 19930111 is about 4464.3152890449. The cubic root of 19930111 is about 271.1252127632.

The spelling of 19930111 in words is "nineteen million, nine hundred thirty thousand, one hundred eleven".