8182381 has 4 divisors (see below), whose sum is σ = 8229852. Its totient is φ = 8134912.

The previous prime is 8182373. The next prime is 8182387. The reversal of 8182381 is 1832818.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5175625 + 3006756 = 2275^2 + 1734^2 .

It is a cyclic number.

It is not a de Polignac number, because 8182381 - 2³ = 8182373 is a prime.

It is a super-2 number, since 2×8182381² = 133902717658322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8182387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23476 + ... + 23821.

It is an arithmetic number, because the mean of its divisors is an integer number (2057463).

Almost surely, 2^8182381 is an apocalyptic number.

It is an amenable number.

8182381 is a deficient number, since it is larger than the sum of its proper divisors (47471).

8182381 is a wasteful number, since it uses less digits than its factorization.

8182381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47470.

The product of its digits is 3072, while the sum is 31.

The square root of 8182381 is about 2860.4861474931. The cubic root of 8182381 is about 201.5084361661.

The spelling of 8182381 in words is "eight million, one hundred eighty-two thousand, three hundred eighty-one".