1989550963 has 4 divisors (see below), whose sum is σ = 1989750928. Its totient is φ = 1989351000.

The previous prime is 1989550957. The next prime is 1989550967. The reversal of 1989550963 is 3690559891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3690559891 = 83 ⋅44464577.

It is a cyclic number.

It is not a de Polignac number, because 1989550963 - 2²⁵ = 1955996531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989550967) 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 in 3 ways as a sum of consecutive naturals, for example, 84231 + ... + 105232.

It is an arithmetic number, because the mean of its divisors is an integer number (497437732).

Almost surely, 2^1989550963 is an apocalyptic number.

1989550963 is a deficient number, since it is larger than the sum of its proper divisors (199965).

1989550963 is a wasteful number, since it uses less digits than its factorization.

1989550963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199964.

The product of its (nonzero) digits is 2624400, while the sum is 55.

The square root of 1989550963 is about 44604.3827779289. The cubic root of 1989550963 is about 1257.7230573436.

The spelling of 1989550963 in words is "one billion, nine hundred eighty-nine million, five hundred fifty thousand, nine hundred sixty-three".