6888139249 has 4 divisors (see below), whose sum is σ = 6930397936. Its totient is φ = 6845880564.

The previous prime is 6888139243. The next prime is 6888139253. The reversal of 6888139249 is 9429318886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6888139249 - 2⁷ = 6888139121 is a prime.

It is a super-2 number, since 2×6888139249² = 94892924627228568002, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6888139193 and 6888139202.

It is not an unprimeable number, because it can be changed into a prime (6888139243) 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, 21129099 + ... + 21129424.

It is an arithmetic number, because the mean of its divisors is an integer number (1732599484).

Almost surely, 2^6888139249 is an apocalyptic number.

It is an amenable number.

6888139249 is a deficient number, since it is larger than the sum of its proper divisors (42258687).

6888139249 is a wasteful number, since it uses less digits than its factorization.

6888139249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42258686.

The product of its digits is 5971968, while the sum is 58.

The square root of 6888139249 is about 82994.8145910333. The cubic root of 6888139249 is about 1902.6868034903.

The spelling of 6888139249 in words is "six billion, eight hundred eighty-eight million, one hundred thirty-nine thousand, two hundred forty-nine".