7811131 has 2 divisors, whose sum is σ = 7811132. Its totient is φ = 7811130.

The previous prime is 7811129. The next prime is 7811171. The reversal of 7811131 is 1311187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7811131 - 2¹ = 7811129 is a prime.

It is a super-2 number, since 2×7811131² = 122027534998322, which contains 22 as substring.

Together with 7811129, it forms a pair of twin primes.

It is an Ulam number.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (7811171) 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 as a sum of consecutive naturals, namely, 3905565 + 3905566.

It is an arithmetic number, because the mean of its divisors is an integer number (3905566).

Almost surely, 2^7811131 is an apocalyptic number.

7811131 is a deficient number, since it is larger than the sum of its proper divisors (1).

7811131 is an equidigital number, since it uses as much as digits as its factorization.

7811131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 22.

The square root of 7811131 is about 2794.8400669806. The cubic root of 7811131 is about 198.4135406748.

The spelling of 7811131 in words is "seven million, eight hundred eleven thousand, one hundred thirty-one".