8181969 has 16 divisors (see below), whose sum is σ = 11197440. Its totient is φ = 5312720.

The previous prime is 8181967. The next prime is 8181977. The reversal of 8181969 is 9691818.

8181969 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 8181969 - 2¹ = 8181967 is a prime.

It is a super-2 number, since 2×8181969² = 133889233433922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8181969.

It is not an unprimeable number, because it can be changed into a prime (8181961) 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, 22612 + ... + 22970.

It is an arithmetic number, because the mean of its divisors is an integer number (699840).

Almost surely, 2^8181969 is an apocalyptic number.

It is an amenable number.

8181969 is a deficient number, since it is larger than the sum of its proper divisors (3015471).

8181969 is a wasteful number, since it uses less digits than its factorization.

8181969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540.

The product of its digits is 31104, while the sum is 42.

The square root of 8181969 is about 2860.4141308559. The cubic root of 8181969 is about 201.5050539856.

The spelling of 8181969 in words is "eight million, one hundred eighty-one thousand, nine hundred sixty-nine".