831257121377 has 2 divisors, whose sum is σ = 831257121378. Its totient is φ = 831257121376.

The previous prime is 831257121349. The next prime is 831257121413. The reversal of 831257121377 is 773121752138.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 764101508641 + 67155612736 = 874129^2 + 259144^2 .

It is a cyclic number.

It is not a de Polignac number, because 831257121377 - 2³⁴ = 814077252193 is a prime.

It is a super-2 number, since 2×831257121377² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (831257121307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415628560688 + 415628560689.

It is an arithmetic number, because the mean of its divisors is an integer number (415628560689).

Almost surely, 2^831257121377 is an apocalyptic number.

It is an amenable number.

831257121377 is a deficient number, since it is larger than the sum of its proper divisors (1).

831257121377 is an equidigital number, since it uses as much as digits as its factorization.

831257121377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493920, while the sum is 47.

The spelling of 831257121377 in words is "eight hundred thirty-one billion, two hundred fifty-seven million, one hundred twenty-one thousand, three hundred seventy-seven".