639113 has 4 divisors (see below), whose sum is σ = 648720. Its totient is φ = 629508.

The previous prime is 639091. The next prime is 639137. The reversal of 639113 is 311936.

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 a cyclic number.

It is not a de Polignac number, because 639113 - 2⁶ = 639049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (639143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4703 + ... + 4836.

It is an arithmetic number, because the mean of its divisors is an integer number (162180).

2⁶³⁹¹¹³ is an apocalyptic number.

It is an amenable number.

639113 is a deficient number, since it is larger than the sum of its proper divisors (9607).

639113 is an equidigital number, since it uses as much as digits as its factorization.

639113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9606.

The product of its digits is 486, while the sum is 23.

The square root of 639113 is about 799.4454327845. The cubic root of 639113 is about 86.1375570370.

The spelling of 639113 in words is "six hundred thirty-nine thousand, one hundred thirteen".