68182181 has 4 divisors (see below), whose sum is σ = 68198700. Its totient is φ = 68165664.

The previous prime is 68182129. The next prime is 68182187. The reversal of 68182181 is 18128186.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4661281 + 63520900 = 2159^2 + 7970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68182181 is a prime.

It is a super-2 number, since 2×68182181² = 9297619611833522, 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 (68182187) 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, 3875 + ... + 12303.

It is an arithmetic number, because the mean of its divisors is an integer number (17049675).

Almost surely, 2^68182181 is an apocalyptic number.

It is an amenable number.

68182181 is a deficient number, since it is larger than the sum of its proper divisors (16519).

68182181 is an equidigital number, since it uses as much as digits as its factorization.

68182181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16518.

The product of its digits is 6144, while the sum is 35.

The square root of 68182181 is about 8257.2502081504. The cubic root of 68182181 is about 408.5296949599.

The spelling of 68182181 in words is "sixty-eight million, one hundred eighty-two thousand, one hundred eighty-one".