1639993109 has 2 divisors, whose sum is σ = 1639993110. Its totient is φ = 1639993108.

The previous prime is 1639993097. The next prime is 1639993141. The reversal of 1639993109 is 9013999361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1450848100 + 189145009 = 38090^2 + 13753^2 .

It is a cyclic number.

It is not a de Polignac number, because 1639993109 - 2¹⁶ = 1639927573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1639995109) 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, 819996554 + 819996555.

It is an arithmetic number, because the mean of its divisors is an integer number (819996555).

Almost surely, 2^1639993109 is an apocalyptic number.

It is an amenable number.

1639993109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1639993109 is an equidigital number, since it uses as much as digits as its factorization.

1639993109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 354294, while the sum is 50.

The square root of 1639993109 is about 40496.8283819857. The cubic root of 1639993109 is about 1179.2720562895.

The spelling of 1639993109 in words is "one billion, six hundred thirty-nine million, nine hundred ninety-three thousand, one hundred nine".