6538921279 has 4 divisors (see below), whose sum is σ = 7133368680. Its totient is φ = 5944473880.

The previous prime is 6538921267. The next prime is 6538921303. The reversal of 6538921279 is 9721298356.

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 6538921279 - 2²⁹ = 6002050367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6538921579) 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, 297223684 + ... + 297223705.

It is an arithmetic number, because the mean of its divisors is an integer number (1783342170).

Almost surely, 2^6538921279 is an apocalyptic number.

6538921279 is a deficient number, since it is larger than the sum of its proper divisors (594447401).

6538921279 is a wasteful number, since it uses less digits than its factorization.

6538921279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594447400.

The product of its digits is 1632960, while the sum is 52.

The square root of 6538921279 is about 80863.5967478568. The cubic root of 6538921279 is about 1869.9731452576.

It can be divided in two parts, 65389 and 21279, that added together give a palindrome (86668).

The spelling of 6538921279 in words is "six billion, five hundred thirty-eight million, nine hundred twenty-one thousand, two hundred seventy-nine".