3121909309 has 2 divisors, whose sum is σ = 3121909310. Its totient is φ = 3121909308.

The previous prime is 3121909277. The next prime is 3121909319. The reversal of 3121909309 is 9039091213.

3121909309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2867602500 + 254306809 = 53550^2 + 15947^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121909309 - 2⁵ = 3121909277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121909319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560954654 + 1560954655.

It is an arithmetic number, because the mean of its divisors is an integer number (1560954655).

Almost surely, 2^3121909309 is an apocalyptic number.

It is an amenable number.

3121909309 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121909309 is an equidigital number, since it uses as much as digits as its factorization.

3121909309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 3121909309 is about 55874.0486182986. The cubic root of 3121909309 is about 1461.5267242379.

The spelling of 3121909309 in words is "three billion, one hundred twenty-one million, nine hundred nine thousand, three hundred nine".