6888139409 has 2 divisors, whose sum is σ = 6888139410. Its totient is φ = 6888139408.

The previous prime is 6888139403. The next prime is 6888139411. The reversal of 6888139409 is 9049318886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6730561600 + 157577809 = 82040^2 + 12553^2 .

It is a cyclic number.

It is not a de Polignac number, because 6888139409 - 2¹² = 6888135313 is a prime.

Together with 6888139411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6888139403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3444069704 + 3444069705.

It is an arithmetic number, because the mean of its divisors is an integer number (3444069705).

Almost surely, 2^6888139409 is an apocalyptic number.

It is an amenable number.

6888139409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6888139409 is an equidigital number, since it uses as much as digits as its factorization.

6888139409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 56.

The square root of 6888139409 is about 82994.8155549490. The cubic root of 6888139409 is about 1902.6868182224.

The spelling of 6888139409 in words is "six billion, eight hundred eighty-eight million, one hundred thirty-nine thousand, four hundred nine".