6991131020 has 24 divisors (see below), whose sum is σ = 14769294624. Its totient is φ = 2779705856.

The previous prime is 6991130999. The next prime is 6991131041. The reversal of 6991131020 is 201311996.

It is an interprime number because it is at equal distance from previous prime (6991130999) and next prime (6991131041).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1043237 + ... + 1049916.

It is an arithmetic number, because the mean of its divisors is an integer number (615387276).

Almost surely, 2^6991131020 is an apocalyptic number.

It is an amenable number.

6991131020 is an abundant number, since it is smaller than the sum of its proper divisors (7778163604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6991131020 is a wasteful number, since it uses less digits than its factorization.

6991131020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093329 (or 2093327 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 6991131020 is about 83612.9835611671. The cubic root of 6991131020 is about 1912.1229485517.

The spelling of 6991131020 in words is "six billion, nine hundred ninety-one million, one hundred thirty-one thousand, twenty".