1231232102161 has 2 divisors, whose sum is σ = 1231232102162. Its totient is φ = 1231232102160.

The previous prime is 1231232102159. The next prime is 1231232102171. The reversal of 1231232102161 is 1612012321321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1231143365761 + 88736400 = 1109569^2 + 9420^2 .

It is an emirp because it is prime and its reverse (1612012321321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231232102161 - 2¹ = 1231232102159 is a prime.

Together with 1231232102159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1231232102171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615616051080 + 615616051081.

It is an arithmetic number, because the mean of its divisors is an integer number (615616051081).

Almost surely, 2^{1231232102161} is an apocalyptic number.

It is an amenable number.

1231232102161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231232102161 is an equidigital number, since it uses as much as digits as its factorization.

1231232102161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 1231232102161 its reverse (1612012321321), we get a palindrome (2843244423482).

The spelling of 1231232102161 in words is "one trillion, two hundred thirty-one billion, two hundred thirty-two million, one hundred two thousand, one hundred sixty-one".