1312200161 has 2 divisors, whose sum is σ = 1312200162. Its totient is φ = 1312200160.

The previous prime is 1312200151. The next prime is 1312200167. The reversal of 1312200161 is 1610022131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1081160161 + 231040000 = 32881^2 + 15200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312200161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312200167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656100080 + 656100081.

It is an arithmetic number, because the mean of its divisors is an integer number (656100081).

Almost surely, 2^1312200161 is an apocalyptic number.

It is an amenable number.

1312200161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312200161 is an equidigital number, since it uses as much as digits as its factorization.

1312200161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1312200161 is about 36224.3034577616. The cubic root of 1312200161 is about 1094.7964039785.

Adding to 1312200161 its reverse (1610022131), we get a palindrome (2922222292).

The spelling of 1312200161 in words is "one billion, three hundred twelve million, two hundred thousand, one hundred sixty-one".