6991981593 has 16 divisors (see below), whose sum is σ = 9501960960. Its totient is φ = 4571725184.

The previous prime is 6991981573. The next prime is 6991981613. The reversal of 6991981593 is 3951891996.

It is an interprime number because it is at equal distance from previous prime (6991981573) and next prime (6991981613).

It is a cyclic number.

It is not a de Polignac number, because 6991981593 - 2⁹ = 6991981081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6991981543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 565168 + ... + 577406.

It is an arithmetic number, because the mean of its divisors is an integer number (593872560).

Almost surely, 2^6991981593 is an apocalyptic number.

It is an amenable number.

6991981593 is a deficient number, since it is larger than the sum of its proper divisors (2509979367).

6991981593 is a wasteful number, since it uses less digits than its factorization.

6991981593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15888.

The product of its digits is 4723920, while the sum is 60.

The square root of 6991981593 is about 83618.0697756173. The cubic root of 6991981593 is about 1912.2004912838.

The spelling of 6991981593 in words is "six billion, nine hundred ninety-one million, nine hundred eighty-one thousand, five hundred ninety-three".