3128807491 has 2 divisors, whose sum is σ = 3128807492. Its totient is φ = 3128807490.

The previous prime is 3128807489. The next prime is 3128807497. The reversal of 3128807491 is 1947088213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3128807491 - 2¹ = 3128807489 is a prime.

Together with 3128807489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3128807497) 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, 1564403745 + 1564403746.

It is an arithmetic number, because the mean of its divisors is an integer number (1564403746).

Almost surely, 2^3128807491 is an apocalyptic number.

3128807491 is a deficient number, since it is larger than the sum of its proper divisors (1).

3128807491 is an equidigital number, since it uses as much as digits as its factorization.

3128807491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 3128807491 is about 55935.7443054081. The cubic root of 3128807491 is about 1462.6023972525.

The spelling of 3128807491 in words is "three billion, one hundred twenty-eight million, eight hundred seven thousand, four hundred ninety-one".