1312231322161 has 2 divisors, whose sum is σ = 1312231322162. Its totient is φ = 1312231322160.

The previous prime is 1312231322111. The next prime is 1312231322219. The reversal of 1312231322161 is 1612231322131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 815262720561 + 496968601600 = 902919^2 + 704960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312231322161 - 2⁹ = 1312231321649 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312231322111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656115661080 + 656115661081.

It is an arithmetic number, because the mean of its divisors is an integer number (656115661081).

Almost surely, 2^{1312231322161} is an apocalyptic number.

It is an amenable number.

1312231322161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312231322161 is an equidigital number, since it uses as much as digits as its factorization.

1312231322161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

Adding to 1312231322161 its reverse (1612231322131), we get a palindrome (2924462644292).

The spelling of 1312231322161 in words is "one trillion, three hundred twelve billion, two hundred thirty-one million, three hundred twenty-two thousand, one hundred sixty-one".