231312121213169 has 2 divisors, whose sum is σ = 231312121213170. Its totient is φ = 231312121213168.

The previous prime is 231312121213127. The next prime is 231312121213181. The reversal of 231312121213169 is 961312121213132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205217514922225 + 26094606290944 = 14325415^2 + 5108288^2 .

It is a cyclic number.

It is not a de Polignac number, because 231312121213169 - 2¹² = 231312121209073 is a prime.

It is a super-2 number, since 2×231312121213169² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231312121213469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115656060606584 + 115656060606585.

It is an arithmetic number, because the mean of its divisors is an integer number (115656060606585).

Almost surely, 2^{231312121213169} is an apocalyptic number.

It is an amenable number.

231312121213169 is a deficient number, since it is larger than the sum of its proper divisors (1).

231312121213169 is an equidigital number, since it uses as much as digits as its factorization.

231312121213169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The spelling of 231312121213169 in words is "two hundred thirty-one trillion, three hundred twelve billion, one hundred twenty-one million, two hundred thirteen thousand, one hundred sixty-nine".