6504139 has 4 divisors (see below), whose sum is σ = 6563920. Its totient is φ = 6444360.

The previous prime is 6504133. The next prime is 6504143. The reversal of 6504139 is 9314056.

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

It is a cyclic number.

It is not a de Polignac number, because 6504139 - 2³ = 6504131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6504131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29727 + ... + 29944.

It is an arithmetic number, because the mean of its divisors is an integer number (1640980).

Almost surely, 2^6504139 is an apocalyptic number.

6504139 is a deficient number, since it is larger than the sum of its proper divisors (59781).

6504139 is a wasteful number, since it uses less digits than its factorization.

6504139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59780.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 6504139 is about 2550.3213523005. The cubic root of 6504139 is about 186.6651619068.

The spelling of 6504139 in words is "six million, five hundred four thousand, one hundred thirty-nine".