1312112161 has 2 divisors, whose sum is σ = 1312112162. Its totient is φ = 1312112160.

The previous prime is 1312112143. The next prime is 1312112183. The reversal of 1312112161 is 1612112131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 963729936 + 348382225 = 31044^2 + 18665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312112161 - 2²¹ = 1310015009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312112561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656056080 + 656056081.

It is an arithmetic number, because the mean of its divisors is an integer number (656056081).

Almost surely, 2^1312112161 is an apocalyptic number.

It is an amenable number.

1312112161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312112161 is an equidigital number, since it uses as much as digits as its factorization.

1312112161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 19.

The square root of 1312112161 is about 36223.0887832609. The cubic root of 1312112161 is about 1094.7719300097.

Adding to 1312112161 its reverse (1612112131), we get a palindrome (2924224292).

The spelling of 1312112161 in words is "one billion, three hundred twelve million, one hundred twelve thousand, one hundred sixty-one".