1983722509 has 2 divisors, whose sum is σ = 1983722510. Its totient is φ = 1983722508.

The previous prime is 1983722497. The next prime is 1983722549. The reversal of 1983722509 is 9052273891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1528028100 + 455694409 = 39090^2 + 21347^2 .

It is a cyclic number.

It is not a de Polignac number, because 1983722509 - 2²³ = 1975333901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1983722549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991861254 + 991861255.

It is an arithmetic number, because the mean of its divisors is an integer number (991861255).

Almost surely, 2^1983722509 is an apocalyptic number.

It is an amenable number.

1983722509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1983722509 is an equidigital number, since it uses as much as digits as its factorization.

1983722509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 1983722509 is about 44538.9998652866. Note that the first 3 decimals coincide. The cubic root of 1983722509 is about 1256.4936759094.

The spelling of 1983722509 in words is "one billion, nine hundred eighty-three million, seven hundred twenty-two thousand, five hundred nine".