1980288217 has 2 divisors, whose sum is σ = 1980288218. Its totient is φ = 1980288216.

The previous prime is 1980288199. The next prime is 1980288227. The reversal of 1980288217 is 7128820891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1509788736 + 470499481 = 38856^2 + 21691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1980288217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1980288227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990144108 + 990144109.

It is an arithmetic number, because the mean of its divisors is an integer number (990144109).

Almost surely, 2^1980288217 is an apocalyptic number.

It is an amenable number.

1980288217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980288217 is an equidigital number, since it uses as much as digits as its factorization.

1980288217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 1980288217 is about 44500.4294024226. The cubic root of 1980288217 is about 1255.7681613363.

The spelling of 1980288217 in words is "one billion, nine hundred eighty million, two hundred eighty-eight thousand, two hundred seventeen".