312130121 has 2 divisors, whose sum is σ = 312130122. Its totient is φ = 312130120.

The previous prime is 312130109. The next prime is 312130141. The reversal of 312130121 is 121031213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286929721 + 25200400 = 16939^2 + 5020^2 .

It is a cyclic number.

It is not a de Polignac number, because 312130121 - 2¹⁸ = 311867977 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 312130096 and 312130105.

It is not a weakly prime, because it can be changed into another prime (312130141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156065060 + 156065061.

It is an arithmetic number, because the mean of its divisors is an integer number (156065061).

Almost surely, 2^312130121 is an apocalyptic number.

It is an amenable number.

312130121 is a deficient number, since it is larger than the sum of its proper divisors (1).

312130121 is an equidigital number, since it uses as much as digits as its factorization.

312130121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 312130121 is about 17667.2046741979. The cubic root of 312130121 is about 678.3365634947.

Adding to 312130121 its reverse (121031213), we get a palindrome (433161334).

The spelling of 312130121 in words is "three hundred twelve million, one hundred thirty thousand, one hundred twenty-one".