3157305209 has 2 divisors, whose sum is σ = 3157305210. Its totient is φ = 3157305208.

The previous prime is 3157305199. The next prime is 3157305233. The reversal of 3157305209 is 9025037513.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3141938809 + 15366400 = 56053^2 + 3920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3157305209 is a prime.

It is a super-4 number, since 4×3157305209⁴ (a number of 39 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (3157305299) 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, 1578652604 + 1578652605.

It is an arithmetic number, because the mean of its divisors is an integer number (1578652605).

Almost surely, 2^3157305209 is an apocalyptic number.

It is an amenable number.

3157305209 is a deficient number, since it is larger than the sum of its proper divisors (1).

3157305209 is an equidigital number, since it uses as much as digits as its factorization.

3157305209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28350, while the sum is 35.

The square root of 3157305209 is about 56189.9030876545. The cubic root of 3157305209 is about 1467.0295282340.

The spelling of 3157305209 in words is "three billion, one hundred fifty-seven million, three hundred five thousand, two hundred nine".