1989633549913 has 4 divisors (see below), whose sum is σ = 1989636669108. Its totient is φ = 1989630430720.

The previous prime is 1989633549907. The next prime is 1989633549929. The reversal of 1989633549913 is 3199453369891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43742467609 + 1945891082304 = 209147^2 + 1394952^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989633549913 - 2²¹ = 1989631452761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989633549613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218248 + ... + 2006713.

It is an arithmetic number, because the mean of its divisors is an integer number (497409167277).

Almost surely, 2^{1989633549913} is an apocalyptic number.

It is an amenable number.

1989633549913 is a deficient number, since it is larger than the sum of its proper divisors (3119195).

1989633549913 is an equidigital number, since it uses as much as digits as its factorization.

1989633549913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3119194.

The product of its digits is 170061120, while the sum is 70.

The spelling of 1989633549913 in words is "one trillion, nine hundred eighty-nine billion, six hundred thirty-three million, five hundred forty-nine thousand, nine hundred thirteen".