231221752481 has 2 divisors, whose sum is σ = 231221752482. Its totient is φ = 231221752480.

The previous prime is 231221752457. The next prime is 231221752493. The reversal of 231221752481 is 184257122132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227238123025 + 3983629456 = 476695^2 + 63116^2 .

It is a cyclic number.

It is not a de Polignac number, because 231221752481 - 2¹⁰ = 231221751457 is a prime.

It is a super-2 number, since 2×231221752481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231221752681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115610876240 + 115610876241.

It is an arithmetic number, because the mean of its divisors is an integer number (115610876241).

Almost surely, 2^231221752481 is an apocalyptic number.

It is an amenable number.

231221752481 is a deficient number, since it is larger than the sum of its proper divisors (1).

231221752481 is an equidigital number, since it uses as much as digits as its factorization.

231221752481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The spelling of 231221752481 in words is "two hundred thirty-one billion, two hundred twenty-one million, seven hundred fifty-two thousand, four hundred eighty-one".