1312530161 has 2 divisors, whose sum is σ = 1312530162. Its totient is φ = 1312530160.

The previous prime is 1312530137. The next prime is 1312530221. The reversal of 1312530161 is 1610352131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1207979536 + 104550625 = 34756^2 + 10225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312530161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1012530161) 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, 656265080 + 656265081.

It is an arithmetic number, because the mean of its divisors is an integer number (656265081).

Almost surely, 2^1312530161 is an apocalyptic number.

It is an amenable number.

1312530161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312530161 is an equidigital number, since it uses as much as digits as its factorization.

1312530161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1312530161 is about 36228.8581244289. The cubic root of 1312530161 is about 1094.8881716174. Note that the first 3 decimals are identical.

Adding to 1312530161 its reverse (1610352131), we get a palindrome (2922882292).

The spelling of 1312530161 in words is "one billion, three hundred twelve million, five hundred thirty thousand, one hundred sixty-one".