6989593721 has 4 divisors (see below), whose sum is σ = 7625011344. Its totient is φ = 6354176100.

The previous prime is 6989593693. The next prime is 6989593747. The reversal of 6989593721 is 1273959896.

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 6989593721 - 2⁶ = 6989593657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6989593771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317708795 + ... + 317708816.

It is an arithmetic number, because the mean of its divisors is an integer number (1906252836).

Almost surely, 2^6989593721 is an apocalyptic number.

It is an amenable number.

6989593721 is a deficient number, since it is larger than the sum of its proper divisors (635417623).

6989593721 is a wasteful number, since it uses less digits than its factorization.

6989593721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635417622.

The product of its digits is 7348320, while the sum is 59.

The square root of 6989593721 is about 83603.7901114537. The cubic root of 6989593721 is about 1911.9827842887.

The spelling of 6989593721 in words is "six billion, nine hundred eighty-nine million, five hundred ninety-three thousand, seven hundred twenty-one".