8181131 has 8 divisors (see below), whose sum is σ = 9900000. Its totient is φ = 6599808.

The previous prime is 8181127. The next prime is 8181139. The reversal of 8181131 is 1311818.

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

It is not a de Polignac number, because 8181131 - 2² = 8181127 is a prime.

It is a super-2 number, since 2×8181131² = 133861808878322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8181097 and 8181106.

It is not an unprimeable number, because it can be changed into a prime (8181139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34256 + ... + 34493.

It is an arithmetic number, because the mean of its divisors is an integer number (1237500).

Almost surely, 2^8181131 is an apocalyptic number.

8181131 is a deficient number, since it is larger than the sum of its proper divisors (1718869).

8181131 is a wasteful number, since it uses less digits than its factorization.

8181131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68773.

The product of its digits is 192, while the sum is 23.

The square root of 8181131 is about 2860.2676448193. The cubic root of 8181131 is about 201.4981743457.

Adding to 8181131 its reverse (1311818), we get a palindrome (9492949).

The spelling of 8181131 in words is "eight million, one hundred eighty-one thousand, one hundred thirty-one".