7991322131 has 8 divisors (see below), whose sum is σ = 8653588944. Its totient is φ = 7335848160.

The previous prime is 7991322121. The next prime is 7991322149. The reversal of 7991322131 is 1312231997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7991322131 is a prime.

It is a super-2 number, since 2×7991322131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7991322121) 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 7 ways as a sum of consecutive naturals, for example, 1695761 + ... + 1700466.

It is an arithmetic number, because the mean of its divisors is an integer number (1081698618).

Almost surely, 2^7991322131 is an apocalyptic number.

7991322131 is a deficient number, since it is larger than the sum of its proper divisors (662266813).

7991322131 is a wasteful number, since it uses less digits than its factorization.

7991322131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3396421.

The product of its digits is 20412, while the sum is 38.

The square root of 7991322131 is about 89394.1951750783. The cubic root of 7991322131 is about 1999.2765826152.

The spelling of 7991322131 in words is "seven billion, nine hundred ninety-one million, three hundred twenty-two thousand, one hundred thirty-one".