1312440121 has 2 divisors, whose sum is σ = 1312440122. Its totient is φ = 1312440120.

The previous prime is 1312440091. The next prime is 1312440131. The reversal of 1312440121 is 1210442131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1292762025 + 19678096 = 35955^2 + 4436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312440121 - 2¹⁷ = 1312309049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312440131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656220060 + 656220061.

It is an arithmetic number, because the mean of its divisors is an integer number (656220061).

Almost surely, 2^1312440121 is an apocalyptic number.

It is an amenable number.

1312440121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312440121 is an equidigital number, since it uses as much as digits as its factorization.

1312440121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1312440121 is about 36227.6154473352. The cubic root of 1312440121 is about 1094.8631344822.

Adding to 1312440121 its reverse (1210442131), we get a palindrome (2522882252).

The spelling of 1312440121 in words is "one billion, three hundred twelve million, four hundred forty thousand, one hundred twenty-one".