231221752493 has 2 divisors, whose sum is σ = 231221752494. Its totient is φ = 231221752492.

The previous prime is 231221752481. The next prime is 231221752547. The reversal of 231221752493 is 394257122132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230796650569 + 425101924 = 480413^2 + 20618^2 .

It is a cyclic number.

It is not a de Polignac number, because 231221752493 - 2¹⁶ = 231221686957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231221752493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231221752093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115610876246 + 115610876247.

It is an arithmetic number, because the mean of its divisors is an integer number (115610876247).

Almost surely, 2^231221752493 is an apocalyptic number.

It is an amenable number.

231221752493 is a deficient number, since it is larger than the sum of its proper divisors (1).

231221752493 is an equidigital number, since it uses as much as digits as its factorization.

231221752493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 41.

The spelling of 231221752493 in words is "two hundred thirty-one billion, two hundred twenty-one million, seven hundred fifty-two thousand, four hundred ninety-three".