231723760721 has 4 divisors (see below), whose sum is σ = 231724859700. Its totient is φ = 231722661744.

The previous prime is 231723760711. The next prime is 231723760747. The reversal of 231723760721 is 127067327132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 110263843600 + 121459917121 = 332060^2 + 348511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231723760721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231723760711) 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, 122726 + ... + 691743.

It is an arithmetic number, because the mean of its divisors is an integer number (57931214925).

Almost surely, 2^231723760721 is an apocalyptic number.

It is an amenable number.

231723760721 is a deficient number, since it is larger than the sum of its proper divisors (1098979).

231723760721 is an equidigital number, since it uses as much as digits as its factorization.

231723760721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098978.

The product of its (nonzero) digits is 148176, while the sum is 41.

The spelling of 231723760721 in words is "two hundred thirty-one billion, seven hundred twenty-three million, seven hundred sixty thousand, seven hundred twenty-one".