19272987697 has 2 divisors, whose sum is σ = 19272987698. Its totient is φ = 19272987696.

The previous prime is 19272987691. The next prime is 19272987733. The reversal of 19272987697 is 79678927291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16404742561 + 2868245136 = 128081^2 + 53556^2 .

It is a cyclic number.

It is not a de Polignac number, because 19272987697 - 2¹¹ = 19272985649 is a prime.

It is not a weakly prime, because it can be changed into another prime (19272987691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9636493848 + 9636493849.

It is an arithmetic number, because the mean of its divisors is an integer number (9636493849).

Almost surely, 2^19272987697 is an apocalyptic number.

It is an amenable number.

19272987697 is a deficient number, since it is larger than the sum of its proper divisors (1).

19272987697 is an equidigital number, since it uses as much as digits as its factorization.

19272987697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48009024, while the sum is 67.

The spelling of 19272987697 in words is "nineteen billion, two hundred seventy-two million, nine hundred eighty-seven thousand, six hundred ninety-seven".