8181249 has 4 divisors (see below), whose sum is σ = 10908336. Its totient is φ = 5454164.

The previous prime is 8181221. The next prime is 8181253. The reversal of 8181249 is 9421818.

8181249 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8181249 - 2¹¹ = 8179201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8181269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1363539 + ... + 1363544.

It is an arithmetic number, because the mean of its divisors is an integer number (2727084).

Almost surely, 2^8181249 is an apocalyptic number.

It is an amenable number.

8181249 is a deficient number, since it is larger than the sum of its proper divisors (2727087).

8181249 is a wasteful number, since it uses less digits than its factorization.

8181249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2727086.

The product of its digits is 4608, while the sum is 33.

The square root of 8181249 is about 2860.2882721852. The cubic root of 8181249 is about 201.4991431062.

The spelling of 8181249 in words is "eight million, one hundred eighty-one thousand, two hundred forty-nine".