1980589217 has 4 divisors (see below), whose sum is σ = 1980701316. Its totient is φ = 1980477120.

The previous prime is 1980589189. The next prime is 1980589291. The reversal of 1980589217 is 7129850891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1612102801 + 368486416 = 40151^2 + 19196^2 .

It is a cyclic number.

It is not a de Polignac number, because 1980589217 - 2¹⁰ = 1980588193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1980582217) 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, 23084 + ... + 67037.

It is an arithmetic number, because the mean of its divisors is an integer number (495175329).

Almost surely, 2^1980589217 is an apocalyptic number.

It is an amenable number.

1980589217 is a deficient number, since it is larger than the sum of its proper divisors (112099).

1980589217 is an equidigital number, since it uses as much as digits as its factorization.

1980589217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112098.

The product of its (nonzero) digits is 362880, while the sum is 50.

The square root of 1980589217 is about 44503.8112637558. The cubic root of 1980589217 is about 1255.8317828947.

The spelling of 1980589217 in words is "one billion, nine hundred eighty million, five hundred eighty-nine thousand, two hundred seventeen".