1980317659 has 2 divisors, whose sum is σ = 1980317660. Its totient is φ = 1980317658.

The previous prime is 1980317653. The next prime is 1980317681. The reversal of 1980317659 is 9567130891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1980317659 - 2⁵ = 1980317627 is a prime.

It is not a weakly prime, because it can be changed into another prime (1980317653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990158829 + 990158830.

It is an arithmetic number, because the mean of its divisors is an integer number (990158830).

Almost surely, 2^1980317659 is an apocalyptic number.

1980317659 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980317659 is an equidigital number, since it uses as much as digits as its factorization.

1980317659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 49.

The square root of 1980317659 is about 44500.7602069897. The cubic root of 1980317659 is about 1255.7743846969.

The spelling of 1980317659 in words is "one billion, nine hundred eighty million, three hundred seventeen thousand, six hundred fifty-nine".