68413181 has 4 divisors (see below), whose sum is σ = 68487132. Its totient is φ = 68339232.

The previous prime is 68413171. The next prime is 68413193. The reversal of 68413181 is 18131486.

It is a happy number.

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 26357956 + 42055225 = 5134^2 + 6485^2 .

It is a cyclic number.

It is not a de Polignac number, because 68413181 - 2¹⁸ = 68151037 is a prime.

It is a super-2 number, since 2×68413181² = 9360726669077522, 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 (68413171) 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, 35570 + ... + 37443.

It is an arithmetic number, because the mean of its divisors is an integer number (17121783).

Almost surely, 2^68413181 is an apocalyptic number.

It is an amenable number.

68413181 is a deficient number, since it is larger than the sum of its proper divisors (73951).

68413181 is an equidigital number, since it uses as much as digits as its factorization.

68413181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73950.

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

The square root of 68413181 is about 8271.2260880718. The cubic root of 68413181 is about 408.9905386548.

The spelling of 68413181 in words is "sixty-eight million, four hundred thirteen thousand, one hundred eighty-one".