1980819469 has 2 divisors, whose sum is σ = 1980819470. Its totient is φ = 1980819468.

The previous prime is 1980819439. The next prime is 1980819497. The reversal of 1980819469 is 9649180891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1677885444 + 302934025 = 40962^2 + 17405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1980819469 - 2⁷ = 1980819341 is a prime.

It is a super-2 number, since 2×1980819469² = 7847291537538883922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1980819419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990409734 + 990409735.

It is an arithmetic number, because the mean of its divisors is an integer number (990409735).

Almost surely, 2^1980819469 is an apocalyptic number.

It is an amenable number.

1980819469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980819469 is an equidigital number, since it uses as much as digits as its factorization.

1980819469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The square root of 1980819469 is about 44506.3980681430. The cubic root of 1980819469 is about 1255.8804462878.

The spelling of 1980819469 in words is "one billion, nine hundred eighty million, eight hundred nineteen thousand, four hundred sixty-nine".