231355306555361 has 2 divisors, whose sum is σ = 231355306555362. Its totient is φ = 231355306555360.

The previous prime is 231355306555357. The next prime is 231355306555421. The reversal of 231355306555361 is 163555603553132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211592836305361 + 19762470250000 = 14546231^2 + 4445500^2 .

It is a cyclic number.

It is not a de Polignac number, because 231355306555361 - 2² = 231355306555357 is a prime.

It is not a weakly prime, because it can be changed into another prime (231355306575361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115677653277680 + 115677653277681.

It is an arithmetic number, because the mean of its divisors is an integer number (115677653277681).

Almost surely, 2^{231355306555361} is an apocalyptic number.

It is an amenable number.

231355306555361 is a deficient number, since it is larger than the sum of its proper divisors (1).

231355306555361 is an equidigital number, since it uses as much as digits as its factorization.

231355306555361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18225000, while the sum is 53.

The spelling of 231355306555361 in words is "two hundred thirty-one trillion, three hundred fifty-five billion, three hundred six million, five hundred fifty-five thousand, three hundred sixty-one".