6991132131 has 12 divisors (see below), whose sum is σ = 10099060608. Its totient is φ = 4660404624.

The previous prime is 6991132123. The next prime is 6991132157. The reversal of 6991132131 is 1312311996.

It is not a de Polignac number, because 6991132131 - 2³ = 6991132123 is a prime.

It is a super-2 number, since 2×6991132131² = 97751856946201202322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6991172131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 165981 + ... + 203793.

It is an arithmetic number, because the mean of its divisors is an integer number (841588384).

Almost surely, 2^6991132131 is an apocalyptic number.

6991132131 is a deficient number, since it is larger than the sum of its proper divisors (3107928477).

6991132131 is a wasteful number, since it uses less digits than its factorization.

6991132131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58362 (or 58359 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 6991132131 is about 83612.9902048719. The cubic root of 6991132131 is about 1912.1230498405.

The spelling of 6991132131 in words is "six billion, nine hundred ninety-one million, one hundred thirty-two thousand, one hundred thirty-one".