6988559 has 4 divisors (see below), whose sum is σ = 7060704. Its totient is φ = 6916416.

The previous prime is 6988549. The next prime is 6988567. The reversal of 6988559 is 9558896.

It is a happy number.

6988559 is an esthetic number in base 14, because in such base its adjacent digits differ by 1.

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 6988559 - 2⁴ = 6988543 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 (6988549) 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, 35927 + ... + 36120.

It is an arithmetic number, because the mean of its divisors is an integer number (1765176).

Almost surely, 2^6988559 is an apocalyptic number.

6988559 is a deficient number, since it is larger than the sum of its proper divisors (72145).

6988559 is an equidigital number, since it uses as much as digits as its factorization.

6988559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72144.

The product of its digits is 777600, while the sum is 50.

The square root of 6988559 is about 2643.5882811058. The cubic root of 6988559 is about 191.1888431338.

The spelling of 6988559 in words is "six million, nine hundred eighty-eight thousand, five hundred fifty-nine".