8181243 has 40 divisors (see below), whose sum is σ = 14310912. Its totient is φ = 4560624.

The previous prime is 8181221. The next prime is 8181253. The reversal of 8181243 is 3421818.

It is not a de Polignac number, because 8181243 - 2⁵ = 8181211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 26496 + ... + 26802.

Almost surely, 2^8181243 is an apocalyptic number.

8181243 is a deficient number, since it is larger than the sum of its proper divisors (6129669).

8181243 is a wasteful number, since it uses less digits than its factorization.

8181243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 364 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 8181243 is about 2860.2872233396. The cubic root of 8181243 is about 201.4990938475.

The spelling of 8181243 in words is "eight million, one hundred eighty-one thousand, two hundred forty-three".