19985351 has 2 divisors, whose sum is σ = 19985352. Its totient is φ = 19985350.

The previous prime is 19985333. The next prime is 19985401. The reversal of 19985351 is 15358991.

It is a weak prime.

It is an emirp because it is prime and its reverse (15358991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19985351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19985299 and 19985308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19985311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9992675 + 9992676.

It is an arithmetic number, because the mean of its divisors is an integer number (9992676).

Almost surely, 2^19985351 is an apocalyptic number.

19985351 is a deficient number, since it is larger than the sum of its proper divisors (1).

19985351 is an equidigital number, since it uses as much as digits as its factorization.

19985351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 41.

The square root of 19985351 is about 4470.4978469965. The cubic root of 19985351 is about 271.3754729664.

The spelling of 19985351 in words is "nineteen million, nine hundred eighty-five thousand, three hundred fifty-one".