6523139 has 4 divisors (see below), whose sum is σ = 7455024. Its totient is φ = 5591256.

The previous prime is 6523133. The next prime is 6523163. The reversal of 6523139 is 9313256.

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 6523139 - 2²⁰ = 5474563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6523133) 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, 465932 + ... + 465945.

It is an arithmetic number, because the mean of its divisors is an integer number (1863756).

Almost surely, 2^6523139 is an apocalyptic number.

6523139 is a deficient number, since it is larger than the sum of its proper divisors (931885).

6523139 is an equidigital number, since it uses as much as digits as its factorization.

6523139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931884.

The product of its digits is 4860, while the sum is 29.

The square root of 6523139 is about 2554.0436566355. The cubic root of 6523139 is about 186.8467483382.

The spelling of 6523139 in words is "six million, five hundred twenty-three thousand, one hundred thirty-nine".