231313002721 has 2 divisors, whose sum is σ = 231313002722. Its totient is φ = 231313002720.

The previous prime is 231313002677. The next prime is 231313002727. The reversal of 231313002721 is 127200313132.

It is a happy number.

231313002721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226042242721 + 5270760000 = 475439^2 + 72600^2 .

It is a cyclic number.

It is not a de Polignac number, because 231313002721 - 2¹⁹ = 231312478433 is a prime.

It is not a weakly prime, because it can be changed into another prime (231313002727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115656501360 + 115656501361.

It is an arithmetic number, because the mean of its divisors is an integer number (115656501361).

Almost surely, 2^231313002721 is an apocalyptic number.

It is an amenable number.

231313002721 is a deficient number, since it is larger than the sum of its proper divisors (1).

231313002721 is an equidigital number, since it uses as much as digits as its factorization.

231313002721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 231313002721 its reverse (127200313132), we get a palindrome (358513315853).

The spelling of 231313002721 in words is "two hundred thirty-one billion, three hundred thirteen million, two thousand, seven hundred twenty-one".