6331639 has 4 divisors (see below), whose sum is σ = 6360256. Its totient is φ = 6303024.

The previous prime is 6331609. The next prime is 6331669. The reversal of 6331639 is 9361336.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (6331609) and next prime (6331669).

It is a cyclic number.

It is not a de Polignac number, because 6331639 - 2⁵ = 6331607 is a prime.

It is an Ulam number.

It is a Duffinian number.

6331639 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6331639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6331609) 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, 13974 + ... + 14419.

It is an arithmetic number, because the mean of its divisors is an integer number (1590064).

Almost surely, 2^6331639 is an apocalyptic number.

6331639 is a deficient number, since it is larger than the sum of its proper divisors (28617).

6331639 is a wasteful number, since it uses less digits than its factorization.

6331639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28616.

The product of its digits is 8748, while the sum is 31.

The square root of 6331639 is about 2516.2748260077. The cubic root of 6331639 is about 185.0001363525. Note that the first 3 decimals are identical.

The spelling of 6331639 in words is "six million, three hundred thirty-one thousand, six hundred thirty-nine".