68134181 has 4 divisors (see below), whose sum is σ = 72142092. Its totient is φ = 64126272.

The previous prime is 68134177. The next prime is 68134189. The reversal of 68134181 is 18143186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18143186 = 2 ⋅9071593.

It can be written as a sum of positive squares in 2 ways, for example, as 18783556 + 49350625 = 4334^2 + 7025^2 .

It is a cyclic number.

It is not a de Polignac number, because 68134181 - 2² = 68134177 is a prime.

It is a super-2 number, since 2×68134181² = 9284533241081522, 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 (68134189) 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, 2003930 + ... + 2003963.

It is an arithmetic number, because the mean of its divisors is an integer number (18035523).

Almost surely, 2^68134181 is an apocalyptic number.

It is an amenable number.

68134181 is a deficient number, since it is larger than the sum of its proper divisors (4007911).

68134181 is a wasteful number, since it uses less digits than its factorization.

68134181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007910.

The product of its digits is 4608, while the sum is 32.

The square root of 68134181 is about 8254.3431598159. The cubic root of 68134181 is about 408.4338046627.

The spelling of 68134181 in words is "sixty-eight million, one hundred thirty-four thousand, one hundred eighty-one".