1312001309 has 2 divisors, whose sum is σ = 1312001310. Its totient is φ = 1312001308.

The previous prime is 1312001297. The next prime is 1312001321. The reversal of 1312001309 is 9031002131.

It is a balanced prime because it is at equal distance from previous prime (1312001297) and next prime (1312001321).

It can be written as a sum of positive squares in only one way, i.e., 1276061284 + 35940025 = 35722^2 + 5995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312001309 - 2¹² = 1311997213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312001329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656000654 + 656000655.

It is an arithmetic number, because the mean of its divisors is an integer number (656000655).

Almost surely, 2^1312001309 is an apocalyptic number.

It is an amenable number.

1312001309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312001309 is an equidigital number, since it uses as much as digits as its factorization.

1312001309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 1312001309 is about 36221.5586219036. The cubic root of 1312001309 is about 1094.7410990387.

The spelling of 1312001309 in words is "one billion, three hundred twelve million, one thousand, three hundred nine".