1316126321 has 2 divisors, whose sum is σ = 1316126322. Its totient is φ = 1316126320.

The previous prime is 1316126293. The next prime is 1316126431. The reversal of 1316126321 is 1236216131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 689325025 + 626801296 = 26255^2 + 25036^2 .

It is a cyclic number.

It is not a de Polignac number, because 1316126321 - 2¹⁴ = 1316109937 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1316120321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658063160 + 658063161.

It is an arithmetic number, because the mean of its divisors is an integer number (658063161).

Almost surely, 2^1316126321 is an apocalyptic number.

It is an amenable number.

1316126321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1316126321 is an equidigital number, since it uses as much as digits as its factorization.

1316126321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 1316126321 is about 36278.4553281972. The cubic root of 1316126321 is about 1095.8872096200.

It can be divided in two parts, 13161 and 26321, that multiplied together give a triangular number (346410681 = T₂₆₃₂₁).

The spelling of 1316126321 in words is "one billion, three hundred sixteen million, one hundred twenty-six thousand, three hundred twenty-one".