1989792289 has 2 divisors, whose sum is σ = 1989792290. Its totient is φ = 1989792288.

The previous prime is 1989792281. The next prime is 1989792293. The reversal of 1989792289 is 9822979891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1224440064 + 765352225 = 34992^2 + 27665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989792289 - 2³ = 1989792281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1989792289.

It is not a weakly prime, because it can be changed into another prime (1989792281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994896144 + 994896145.

It is an arithmetic number, because the mean of its divisors is an integer number (994896145).

Almost surely, 2^1989792289 is an apocalyptic number.

It is an amenable number.

1989792289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989792289 is an equidigital number, since it uses as much as digits as its factorization.

1989792289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 64.

The square root of 1989792289 is about 44607.0878784975. The cubic root of 1989792289 is about 1257.7739078469.

The spelling of 1989792289 in words is "one billion, nine hundred eighty-nine million, seven hundred ninety-two thousand, two hundred eighty-nine".