1920603989 has 2 divisors, whose sum is σ = 1920603990. Its totient is φ = 1920603988.

The previous prime is 1920603953. The next prime is 1920603991. The reversal of 1920603989 is 9893060291.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1401903364 + 518700625 = 37442^2 + 22775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1920603989 - 2²⁸ = 1652168533 is a prime.

Together with 1920603991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1920603089) 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, 960301994 + 960301995.

It is an arithmetic number, because the mean of its divisors is an integer number (960301995).

Almost surely, 2^1920603989 is an apocalyptic number.

It is an amenable number.

1920603989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920603989 is an equidigital number, since it uses as much as digits as its factorization.

1920603989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 1920603989 is about 43824.6961084729. The cubic root of 1920603989 is about 1243.0233174854.

The spelling of 1920603989 in words is "one billion, nine hundred twenty million, six hundred three thousand, nine hundred eighty-nine".