231355012123161 has 6 divisors (see below), whose sum is σ = 334179461955690. Its totient is φ = 154236674748768.

The previous prime is 231355012123051. The next prime is 231355012123163. The reversal of 231355012123161 is 161321210553132.

It is a happy number.

231355012123161 is a `hidden beast` number, since 2 + 3 + 1 + 3 + 550 + 1 + 2 + 12 + 31 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 116829292737600 + 114525719385561 = 10808760^2 + 10701669^2 .

It is not a de Polignac number, because 231355012123161 - 2¹¹ = 231355012121113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231355012123163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12853056229056 + ... + 12853056229073.

It is an arithmetic number, because the mean of its divisors is an integer number (55696576992615).

Almost surely, 2^{231355012123161} is an apocalyptic number.

It is an amenable number.

231355012123161 is a deficient number, since it is larger than the sum of its proper divisors (102824449832529).

231355012123161 is a wasteful number, since it uses less digits than its factorization.

231355012123161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25706112458135 (or 25706112458132 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

Adding to 231355012123161 its reverse (161321210553132), we get a palindrome (392676222676293).

The spelling of 231355012123161 in words is "two hundred thirty-one trillion, three hundred fifty-five billion, twelve million, one hundred twenty-three thousand, one hundred sixty-one".