231551345411521 has 2 divisors, whose sum is σ = 231551345411522. Its totient is φ = 231551345411520.

The previous prime is 231551345411447. The next prime is 231551345411593. The reversal of 231551345411521 is 125114543155132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129139677793296 + 102411667618225 = 11363964^2 + 10119865^2 .

It is a cyclic number.

It is not a de Polignac number, because 231551345411521 - 2²⁷ = 231551211193793 is a prime.

It is not a weakly prime, because it can be changed into another prime (231551345421521) by changing a digit.

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 as a sum of consecutive naturals, namely, 115775672705760 + 115775672705761.

It is an arithmetic number, because the mean of its divisors is an integer number (115775672705761).

Almost surely, 2^{231551345411521} is an apocalyptic number.

It is an amenable number.

231551345411521 is a deficient number, since it is larger than the sum of its proper divisors (1).

231551345411521 is an equidigital number, since it uses as much as digits as its factorization.

231551345411521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360000, while the sum is 43.

Adding to 231551345411521 its reverse (125114543155132), we get a palindrome (356665888566653).

The spelling of 231551345411521 in words is "two hundred thirty-one trillion, five hundred fifty-one billion, three hundred forty-five million, four hundred eleven thousand, five hundred twenty-one".