1980831889 has 4 divisors (see below), whose sum is σ = 2034367924. Its totient is φ = 1927295856.

The previous prime is 1980831887. The next prime is 1980831901. The reversal of 1980831889 is 9881380891.

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 825987600 + 1154844289 = 28740^2 + 33983^2 .

It is a cyclic number.

It is not a de Polignac number, because 1980831889 - 2¹ = 1980831887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1980831883) 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, 26767962 + ... + 26768035.

It is an arithmetic number, because the mean of its divisors is an integer number (508591981).

Almost surely, 2^1980831889 is an apocalyptic number.

It is an amenable number.

1980831889 is a deficient number, since it is larger than the sum of its proper divisors (53536035).

1980831889 is an equidigital number, since it uses as much as digits as its factorization.

1980831889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53536034.

The product of its (nonzero) digits is 995328, while the sum is 55.

The square root of 1980831889 is about 44506.5375984248. The cubic root of 1980831889 is about 1255.8830711278.

The spelling of 1980831889 in words is "one billion, nine hundred eighty million, eight hundred thirty-one thousand, eight hundred eighty-nine".