1301212309 has 2 divisors, whose sum is σ = 1301212310. Its totient is φ = 1301212308.

The previous prime is 1301212303. The next prime is 1301212349. The reversal of 1301212309 is 9032121031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 723771409 + 577440900 = 26903^2 + 24030^2 .

It is an emirp because it is prime and its reverse (9032121031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1301212309 - 2⁹ = 1301211797 is a prime.

It is a super-2 number, since 2×1301212309² = 3386306946186222962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1301212309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1301212303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650606154 + 650606155.

It is an arithmetic number, because the mean of its divisors is an integer number (650606155).

Almost surely, 2^1301212309 is an apocalyptic number.

It is an amenable number.

1301212309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1301212309 is an equidigital number, since it uses as much as digits as its factorization.

1301212309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1301212309 is about 36072.3205380524. The cubic root of 1301212309 is about 1091.7320354566.

The spelling of 1301212309 in words is "one billion, three hundred one million, two hundred twelve thousand, three hundred nine".