639379113 has 4 divisors (see below), whose sum is σ = 852505488. Its totient is φ = 426252740.

The previous prime is 639379079. The next prime is 639379157. The reversal of 639379113 is 311973936.

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 639379113 - 2¹² = 639375017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639379313) 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 in 3 ways as a sum of consecutive naturals, for example, 106563183 + ... + 106563188.

It is an arithmetic number, because the mean of its divisors is an integer number (213126372).

Almost surely, 2^639379113 is an apocalyptic number.

It is an amenable number.

639379113 is a deficient number, since it is larger than the sum of its proper divisors (213126375).

639379113 is a wasteful number, since it uses less digits than its factorization.

639379113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213126374.

The product of its digits is 91854, while the sum is 42.

The square root of 639379113 is about 25285.9469468715. The cubic root of 639379113 is about 861.4951065762.

The spelling of 639379113 in words is "six hundred thirty-nine million, three hundred seventy-nine thousand, one hundred thirteen".