6988591 has 4 divisors (see below), whose sum is σ = 7027384. Its totient is φ = 6949800.

The previous prime is 6988589. The next prime is 6988603. The reversal of 6988591 is 1958896.

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 6988591 - 2¹ = 6988589 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 (6988511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19125 + ... + 19486.

It is an arithmetic number, because the mean of its divisors is an integer number (1756846).

Almost surely, 2^6988591 is an apocalyptic number.

6988591 is a deficient number, since it is larger than the sum of its proper divisors (38793).

6988591 is a wasteful number, since it uses less digits than its factorization.

6988591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38792.

The product of its digits is 155520, while the sum is 46.

The square root of 6988591 is about 2643.5943334786. The cubic root of 6988591 is about 191.1891349457.

The spelling of 6988591 in words is "six million, nine hundred eighty-eight thousand, five hundred ninety-one".