19681713 has 6 divisors (see below), whose sum is σ = 28429154. Its totient is φ = 13121136.

The previous prime is 19681703. The next prime is 19681723. The reversal of 19681713 is 31718691.

It is an interprime number because it is at equal distance from previous prime (19681703) and next prime (19681723).

It can be written as a sum of positive squares in only one way, i.e., 19607184 + 74529 = 4428^2 + 273^2 .

It is not a de Polignac number, because 19681713 - 2⁹ = 19681201 is a prime.

It is a super-2 number, since 2×19681713² = 774739653228738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19681703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1093420 + ... + 1093437.

Almost surely, 2^19681713 is an apocalyptic number.

It is an amenable number.

19681713 is a deficient number, since it is larger than the sum of its proper divisors (8747441).

19681713 is a wasteful number, since it uses less digits than its factorization.

19681713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2186863 (or 2186860 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 19681713 is about 4436.4076683731. The cubic root of 19681713 is about 269.9941150981.

The spelling of 19681713 in words is "nineteen million, six hundred eighty-one thousand, seven hundred thirteen".