231721068085 has 8 divisors (see below), whose sum is σ = 299454918840. Its totient is φ = 171117096384.

The previous prime is 231721068067. The next prime is 231721068097. The reversal of 231721068085 is 580860127132.

It can be written as a sum of positive squares in 4 ways, for example, as 29039227281 + 202681840804 = 170409^2 + 450202^2 .

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

It is not a de Polignac number, because 231721068085 - 2¹⁷ = 231720937013 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1782469690 + ... + 1782469819.

It is an arithmetic number, because the mean of its divisors is an integer number (37431864855).

Almost surely, 2^231721068085 is an apocalyptic number.

It is an amenable number.

231721068085 is a deficient number, since it is larger than the sum of its proper divisors (67733850755).

231721068085 is a wasteful number, since it uses less digits than its factorization.

231721068085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3564939527.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 231721068085 in words is "two hundred thirty-one billion, seven hundred twenty-one million, sixty-eight thousand, eighty-five".