1639606105 has 4 divisors (see below), whose sum is σ = 1967527332. Its totient is φ = 1311684880.

The previous prime is 1639606099. The next prime is 1639606127. The reversal of 1639606105 is 5016069361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5016069361 = 29 ⋅172967909.

It can be written as a sum of positive squares in 2 ways, for example, as 418243401 + 1221362704 = 20451^2 + 34948^2 .

It is not a de Polignac number, because 1639606105 - 2²⁵ = 1606051673 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163960606 + ... + 163960615.

It is an arithmetic number, because the mean of its divisors is an integer number (491881833).

Almost surely, 2^1639606105 is an apocalyptic number.

It is an amenable number.

1639606105 is a deficient number, since it is larger than the sum of its proper divisors (327921227).

1639606105 is an equidigital number, since it uses as much as digits as its factorization.

1639606105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327921226.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 1639606105 is about 40492.0498987147. The cubic root of 1639606105 is about 1179.1792878293.

The spelling of 1639606105 in words is "one billion, six hundred thirty-nine million, six hundred six thousand, one hundred five".