6988561 has 4 divisors (see below), whose sum is σ = 7356400. Its totient is φ = 6620724.

The previous prime is 6988549. The next prime is 6988567. The reversal of 6988561 is 1658896.

6988561 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, 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 6988561 - 2⁹ = 6988049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6988567) 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, 183891 + ... + 183928.

It is an arithmetic number, because the mean of its divisors is an integer number (1839100).

Almost surely, 2^6988561 is an apocalyptic number.

It is an amenable number.

6988561 is a deficient number, since it is larger than the sum of its proper divisors (367839).

6988561 is a wasteful number, since it uses less digits than its factorization.

6988561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367838.

The product of its digits is 103680, while the sum is 43.

The square root of 6988561 is about 2643.5886593795. The cubic root of 6988561 is about 191.1888613721.

The spelling of 6988561 in words is "six million, nine hundred eighty-eight thousand, five hundred sixty-one".