1982471809 has 2 divisors, whose sum is σ = 1982471810. Its totient is φ = 1982471808.

The previous prime is 1982471737. The next prime is 1982471819. The reversal of 1982471809 is 9081742891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1849000000 + 133471809 = 43000^2 + 11553^2 .

It is a cyclic number.

It is not a de Polignac number, because 1982471809 - 2⁷ = 1982471681 is a prime.

It is not a weakly prime, because it can be changed into another prime (1982471819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991235904 + 991235905.

It is an arithmetic number, because the mean of its divisors is an integer number (991235905).

Almost surely, 2^1982471809 is an apocalyptic number.

It is an amenable number.

1982471809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1982471809 is an equidigital number, since it uses as much as digits as its factorization.

1982471809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 49.

The square root of 1982471809 is about 44524.9571476492. The cubic root of 1982471809 is about 1256.2295551271.

The spelling of 1982471809 in words is "one billion, nine hundred eighty-two million, four hundred seventy-one thousand, eight hundred nine".