19801297 has 2 divisors, whose sum is σ = 19801298. Its totient is φ = 19801296.

The previous prime is 19801291. The next prime is 19801307. The reversal of 19801297 is 79210891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19678096 + 123201 = 4436^2 + 351^2 .

It is a cyclic number.

It is not a de Polignac number, because 19801297 - 2¹¹ = 19799249 is a prime.

It is not a weakly prime, because it can be changed into another prime (19801291) 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 as a sum of consecutive naturals, namely, 9900648 + 9900649.

It is an arithmetic number, because the mean of its divisors is an integer number (9900649).

Almost surely, 2^19801297 is an apocalyptic number.

It is an amenable number.

19801297 is a deficient number, since it is larger than the sum of its proper divisors (1).

19801297 is an equidigital number, since it uses as much as digits as its factorization.

19801297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 19801297 is about 4449.8648294077. The cubic root of 19801297 is about 270.5398298833.

The spelling of 19801297 in words is "nineteen million, eight hundred one thousand, two hundred ninety-seven".