19893127369 has 2 divisors, whose sum is σ = 19893127370. Its totient is φ = 19893127368.

The previous prime is 19893127343. The next prime is 19893127379. The reversal of 19893127369 is 96372139891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17965917369 + 1927210000 = 134037^2 + 43900^2 .

It is a cyclic number.

It is not a de Polignac number, because 19893127369 - 2¹¹ = 19893125321 is a prime.

It is a super-2 number, since 2×19893127369² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19893127379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9946563684 + 9946563685.

It is an arithmetic number, because the mean of its divisors is an integer number (9946563685).

Almost surely, 2^19893127369 is an apocalyptic number.

It is an amenable number.

19893127369 is a deficient number, since it is larger than the sum of its proper divisors (1).

19893127369 is an equidigital number, since it uses as much as digits as its factorization.

19893127369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 58.

The spelling of 19893127369 in words is "nineteen billion, eight hundred ninety-three million, one hundred twenty-seven thousand, three hundred sixty-nine".