19913233 has 2 divisors, whose sum is σ = 19913234. Its totient is φ = 19913232.

The previous prime is 19913209. The next prime is 19913269. The reversal of 19913233 is 33231991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10810944 + 9102289 = 3288^2 + 3017^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19913233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19913195 and 19913204.

It is not a weakly prime, because it can be changed into another prime (19913203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9956616 + 9956617.

It is an arithmetic number, because the mean of its divisors is an integer number (9956617).

Almost surely, 2^19913233 is an apocalyptic number.

It is an amenable number.

19913233 is a deficient number, since it is larger than the sum of its proper divisors (1).

19913233 is an equidigital number, since it uses as much as digits as its factorization.

19913233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 31.

The square root of 19913233 is about 4462.4245651887. The cubic root of 19913233 is about 271.0486561783.

The spelling of 19913233 in words is "nineteen million, nine hundred thirteen thousand, two hundred thirty-three".