231621366027287 has 2 divisors, whose sum is σ = 231621366027288. Its totient is φ = 231621366027286.

The previous prime is 231621366027281. The next prime is 231621366027353. The reversal of 231621366027287 is 782720663126132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231621366027287 - 2⁴⁰ = 230521854399511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231621366027281) 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, 115810683013643 + 115810683013644.

It is an arithmetic number, because the mean of its divisors is an integer number (115810683013644).

Almost surely, 2^{231621366027287} is an apocalyptic number.

231621366027287 is a deficient number, since it is larger than the sum of its proper divisors (1).

231621366027287 is an equidigital number, since it uses as much as digits as its factorization.

231621366027287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12192768, while the sum is 56.

The spelling of 231621366027287 in words is "two hundred thirty-one trillion, six hundred twenty-one billion, three hundred sixty-six million, twenty-seven thousand, two hundred eighty-seven".