3121243309 has 2 divisors, whose sum is σ = 3121243310. Its totient is φ = 3121243308.

The previous prime is 3121243273. The next prime is 3121243327. The reversal of 3121243309 is 9033421213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3114756100 + 6487209 = 55810^2 + 2547^2 .

It is an emirp because it is prime and its reverse (9033421213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3121243309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121243379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560621654 + 1560621655.

It is an arithmetic number, because the mean of its divisors is an integer number (1560621655).

Almost surely, 2^3121243309 is an apocalyptic number.

It is an amenable number.

3121243309 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121243309 is an equidigital number, since it uses as much as digits as its factorization.

3121243309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 3121243309 is about 55868.0884673890. The cubic root of 3121243309 is about 1461.4227871995.

The spelling of 3121243309 in words is "three billion, one hundred twenty-one million, two hundred forty-three thousand, three hundred nine".