3128797687969 has 2 divisors, whose sum is σ = 3128797687970. Its totient is φ = 3128797687968.

The previous prime is 3128797687943. The next prime is 3128797687979. The reversal of 3128797687969 is 9697867978213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2727997272225 + 400800415744 = 1651665^2 + 633088^2 .

It is an emirp because it is prime and its reverse (9697867978213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3128797687969 - 2¹⁵ = 3128797655201 is a prime.

It is a super-2 number, since 2×3128797687969² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3128797687892 and 3128797687901.

It is not a weakly prime, because it can be changed into another prime (3128797687979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1564398843984 + 1564398843985.

It is an arithmetic number, because the mean of its divisors is an integer number (1564398843985).

Almost surely, 2^{3128797687969} is an apocalyptic number.

It is an amenable number.

3128797687969 is a deficient number, since it is larger than the sum of its proper divisors (1).

3128797687969 is an equidigital number, since it uses as much as digits as its factorization.

3128797687969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456649728, while the sum is 82.

The spelling of 3128797687969 in words is "three trillion, one hundred twenty-eight billion, seven hundred ninety-seven million, six hundred eighty-seven thousand, nine hundred sixty-nine".