1989779329 has 2 divisors, whose sum is σ = 1989779330. Its totient is φ = 1989779328.

The previous prime is 1989779287. The next prime is 1989779359. The reversal of 1989779329 is 9239779891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1955673729 + 34105600 = 44223^2 + 5840^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989779329 - 2¹¹ = 1989777281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1989779359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994889664 + 994889665.

It is an arithmetic number, because the mean of its divisors is an integer number (994889665).

Almost surely, 2^1989779329 is an apocalyptic number.

It is an amenable number.

1989779329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989779329 is an equidigital number, since it uses as much as digits as its factorization.

1989779329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15431472, while the sum is 64.

The square root of 1989779329 is about 44606.9426098674. The cubic root of 1989779329 is about 1257.7711771121.

The spelling of 1989779329 in words is "one billion, nine hundred eighty-nine million, seven hundred seventy-nine thousand, three hundred twenty-nine".