6988521 has 4 divisors (see below), whose sum is σ = 9318032. Its totient is φ = 4659012.

The previous prime is 6988511. The next prime is 6988537. The reversal of 6988521 is 1258896.

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 not a de Polignac number, because 6988521 - 2¹⁷ = 6857449 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6988521.

It is not an unprimeable number, because it can be changed into a prime (6988511) 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, 1164751 + ... + 1164756.

It is an arithmetic number, because the mean of its divisors is an integer number (2329508).

Almost surely, 2^6988521 is an apocalyptic number.

It is an amenable number.

6988521 is a deficient number, since it is larger than the sum of its proper divisors (2329511).

6988521 is a wasteful number, since it uses less digits than its factorization.

6988521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329510.

The product of its digits is 34560, while the sum is 39.

The square root of 6988521 is about 2643.5810938952. The cubic root of 6988521 is about 191.1884966061.

The spelling of 6988521 in words is "six million, nine hundred eighty-eight thousand, five hundred twenty-one".