639279129 has 4 divisors (see below), whose sum is σ = 852372176. Its totient is φ = 426186084.

The previous prime is 639279119. The next prime is 639279131. The reversal of 639279129 is 921972936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 639279129 - 2¹¹ = 639277081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639279119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106546519 + ... + 106546524.

It is an arithmetic number, because the mean of its divisors is an integer number (213093044).

Almost surely, 2^639279129 is an apocalyptic number.

It is an amenable number.

639279129 is a deficient number, since it is larger than the sum of its proper divisors (213093047).

639279129 is a wasteful number, since it uses less digits than its factorization.

639279129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213093046.

The product of its digits is 367416, while the sum is 48.

The square root of 639279129 is about 25283.9698030195. The cubic root of 639279129 is about 861.4501983127.

The spelling of 639279129 in words is "six hundred thirty-nine million, two hundred seventy-nine thousand, one hundred twenty-nine".