1989663501 has 24 divisors (see below), whose sum is σ = 3055742272. Its totient is φ = 1128067200.

The previous prime is 1989663469. The next prime is 1989663503. The reversal of 1989663501 is 1053669891.

It is not a de Polignac number, because 1989663501 - 2⁵ = 1989663469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989663503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 357621 + ... + 363141.

Almost surely, 2^1989663501 is an apocalyptic number.

It is an amenable number.

1989663501 is a deficient number, since it is larger than the sum of its proper divisors (1066078771).

1989663501 is an equidigital number, since it uses as much as digits as its factorization.

1989663501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5793 (or 5662 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 1989663501 is about 44605.6442728944. The cubic root of 1989663501 is about 1257.7467710645.

The spelling of 1989663501 in words is "one billion, nine hundred eighty-nine million, six hundred sixty-three thousand, five hundred one".