19900990289 has 2 divisors, whose sum is σ = 19900990290. Its totient is φ = 19900990288.

The previous prime is 19900990271. The next prime is 19900990301. The reversal of 19900990289 is 98209900991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19037100625 + 863889664 = 137975^2 + 29392^2 .

It is an emirp because it is prime and its reverse (98209900991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19900990289 - 2⁸ = 19900990033 is a prime.

It is a super-3 number, since 3×19900990289³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (19900990229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950495144 + 9950495145.

It is an arithmetic number, because the mean of its divisors is an integer number (9950495145).

Almost surely, 2^19900990289 is an apocalyptic number.

It is an amenable number.

19900990289 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900990289 is an equidigital number, since it uses as much as digits as its factorization.

19900990289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 944784, while the sum is 56.

The spelling of 19900990289 in words is "nineteen billion, nine hundred million, nine hundred ninety thousand, two hundred eighty-nine".