7991102231 has 12 divisors (see below), whose sum is σ = 9331957008. Its totient is φ = 6822853632.

The previous prime is 7991102227. The next prime is 7991102233. The reversal of 7991102231 is 1322011997.

It is not a de Polignac number, because 7991102231 - 2² = 7991102227 is a prime.

It is a super-2 number, since 2×7991102231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7991102191 and 7991102200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991102233) 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, 304691 + ... + 329876.

It is an arithmetic number, because the mean of its divisors is an integer number (777663084).

Almost surely, 2^7991102231 is an apocalyptic number.

7991102231 is a deficient number, since it is larger than the sum of its proper divisors (1340854777).

7991102231 is a wasteful number, since it uses less digits than its factorization.

7991102231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634838 (or 634831 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 7991102231 is about 89392.9652209837. The cubic root of 7991102231 is about 1999.2582441832.

The spelling of 7991102231 in words is "seven billion, nine hundred ninety-one million, one hundred two thousand, two hundred thirty-one".