19917713 has 2 divisors, whose sum is σ = 19917714. Its totient is φ = 19917712.

The previous prime is 19917697. The next prime is 19917721. The reversal of 19917713 is 31771991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17909824 + 2007889 = 4232^2 + 1417^2 .

It is a cyclic number.

It is not a de Polignac number, because 19917713 - 2⁴ = 19917697 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (19917743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9958856 + 9958857.

It is an arithmetic number, because the mean of its divisors is an integer number (9958857).

Almost surely, 2^19917713 is an apocalyptic number.

It is an amenable number.

19917713 is a deficient number, since it is larger than the sum of its proper divisors (1).

19917713 is an equidigital number, since it uses as much as digits as its factorization.

19917713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11907, while the sum is 38.

The square root of 19917713 is about 4462.9265062288. The cubic root of 19917713 is about 271.0689811372.

The spelling of 19917713 in words is "nineteen million, nine hundred seventeen thousand, seven hundred thirteen".