68218131 has 8 divisors (see below), whose sum is σ = 91296720. Its totient is φ = 45309152.

The previous prime is 68218123. The next prime is 68218169. The reversal of 68218131 is 13181286.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68218131 - 2³ = 68218123 is a prime.

It is a super-2 number, since 2×68218131² = 9307426794266322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68218181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41460 + ... + 43073.

It is an arithmetic number, because the mean of its divisors is an integer number (11412090).

Almost surely, 2^68218131 is an apocalyptic number.

68218131 is a deficient number, since it is larger than the sum of its proper divisors (23078589).

68218131 is a wasteful number, since it uses less digits than its factorization.

68218131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84805.

The product of its digits is 2304, while the sum is 30.

The square root of 68218131 is about 8259.4267960918. The cubic root of 68218131 is about 408.6014833257.

The spelling of 68218131 in words is "sixty-eight million, two hundred eighteen thousand, one hundred thirty-one".