19696657 has 2 divisors, whose sum is σ = 19696658. Its totient is φ = 19696656.

The previous prime is 19696643. The next prime is 19696669. The reversal of 19696657 is 75669691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10265616 + 9431041 = 3204^2 + 3071^2 .

It is an emirp because it is prime and its reverse (75669691) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19696657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19696657.

It is not a weakly prime, because it can be changed into another prime (19696637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9848328 + 9848329.

It is an arithmetic number, because the mean of its divisors is an integer number (9848329).

Almost surely, 2^19696657 is an apocalyptic number.

It is an amenable number.

19696657 is a deficient number, since it is larger than the sum of its proper divisors (1).

19696657 is an equidigital number, since it uses as much as digits as its factorization.

19696657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 49.

The square root of 19696657 is about 4438.0915943680. The cubic root of 19696657 is about 270.0624318363.

The spelling of 19696657 in words is "nineteen million, six hundred ninety-six thousand, six hundred fifty-seven".