12431220161 has 2 divisors, whose sum is σ = 12431220162. Its totient is φ = 12431220160.

The previous prime is 12431220101. The next prime is 12431220167. The reversal of 12431220161 is 16102213421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9691221136 + 2739999025 = 98444^2 + 52345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12431220161 is a prime.

It is not a weakly prime, because it can be changed into another prime (12431220167) 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 as a sum of consecutive naturals, namely, 6215610080 + 6215610081.

It is an arithmetic number, because the mean of its divisors is an integer number (6215610081).

Almost surely, 2^12431220161 is an apocalyptic number.

It is an amenable number.

12431220161 is a deficient number, since it is larger than the sum of its proper divisors (1).

12431220161 is an equidigital number, since it uses as much as digits as its factorization.

12431220161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 12431220161 its reverse (16102213421), we get a palindrome (28533433582).

The spelling of 12431220161 in words is "twelve billion, four hundred thirty-one million, two hundred twenty thousand, one hundred sixty-one".