8131791 has 16 divisors (see below), whose sum is σ = 11491200. Its totient is φ = 5100768.

The previous prime is 8131777. The next prime is 8131807. The reversal of 8131791 is 1971318.

It is not a de Polignac number, because 8131791 - 2¹⁰ = 8130767 is a prime.

It is a super-2 number, since 2×8131791² = 132252049735362, which contains 22 as substring.

8131791 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8131741) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 9805 + ... + 10601.

It is an arithmetic number, because the mean of its divisors is an integer number (718200).

Almost surely, 2^8131791 is an apocalyptic number.

8131791 is a deficient number, since it is larger than the sum of its proper divisors (3359409).

8131791 is a wasteful number, since it uses less digits than its factorization.

8131791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998.

The product of its digits is 1512, while the sum is 30.

The square root of 8131791 is about 2851.6295341436. The cubic root of 8131791 is about 201.0922820729.

The spelling of 8131791 in words is "eight million, one hundred thirty-one thousand, seven hundred ninety-one".