3128797687891 has 2 divisors, whose sum is σ = 3128797687892. Its totient is φ = 3128797687890.

The previous prime is 3128797687879. The next prime is 3128797687927. The reversal of 3128797687891 is 1987867978213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3128797687891 - 2¹¹ = 3128797685843 is a prime.

It is not a weakly prime, because it can be changed into another prime (3128797687391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1564398843945 + 1564398843946.

It is an arithmetic number, because the mean of its divisors is an integer number (1564398843946).

Almost surely, 2^{3128797687891} is an apocalyptic number.

3128797687891 is a deficient number, since it is larger than the sum of its proper divisors (1).

3128797687891 is an equidigital number, since it uses as much as digits as its factorization.

3128797687891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 512096256, while the sum is 76.

The spelling of 3128797687891 in words is "three trillion, one hundred twenty-eight billion, seven hundred ninety-seven million, six hundred eighty-seven thousand, eight hundred ninety-one".