1989161773 has 16 divisors (see below), whose sum is σ = 2087195904. Its totient is φ = 1893870720.

The previous prime is 1989161767. The next prime is 1989161791. The reversal of 1989161773 is 3771619891.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1989161773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1989161773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989161723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357136 + ... + 362662.

It is an arithmetic number, because the mean of its divisors is an integer number (130449744).

Almost surely, 2^1989161773 is an apocalyptic number.

It is an amenable number.

1989161773 is a deficient number, since it is larger than the sum of its proper divisors (98034131).

1989161773 is a wasteful number, since it uses less digits than its factorization.

1989161773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5772.

The product of its digits is 571536, while the sum is 52.

The square root of 1989161773 is about 44600.0198766772. The cubic root of 1989161773 is about 1257.6410413231.

The spelling of 1989161773 in words is "one billion, nine hundred eighty-nine million, one hundred sixty-one thousand, seven hundred seventy-three".