68181589 has 6 divisors (see below), whose sum is σ = 79313334. Its totient is φ = 58441320.

The previous prime is 68181569. The next prime is 68181599. The reversal of 68181589 is 98518186.

It can be written as a sum of positive squares in only one way, i.e., 43758225 + 24423364 = 6615^2 + 4942^2 .

It is not a de Polignac number, because 68181589 - 2¹¹ = 68179541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68181569) 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 5 ways as a sum of consecutive naturals, for example, 695682 + ... + 695779.

It is an arithmetic number, because the mean of its divisors is an integer number (13218889).

Almost surely, 2^68181589 is an apocalyptic number.

It is an amenable number.

68181589 is a deficient number, since it is larger than the sum of its proper divisors (11131745).

68181589 is a wasteful number, since it uses less digits than its factorization.

68181589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391475 (or 1391468 counting only the distinct ones).

The product of its digits is 138240, while the sum is 46.

The square root of 68181589 is about 8257.2143607878. The cubic root of 68181589 is about 408.5285125871.

The spelling of 68181589 in words is "sixty-eight million, one hundred eighty-one thousand, five hundred eighty-nine".