128312831 has 2 divisors, whose sum is σ = 128312832. Its totient is φ = 128312830.

The previous prime is 128312819. The next prime is 128312843. The reversal of 128312831 is 138213821.

It is a balanced prime because it is at equal distance from previous prime (128312819) and next prime (128312843).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128312831 is a prime.

It is a super-2 number, since 2×128312831² = 32928365198469122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 128312794 and 128312803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128312851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64156415 + 64156416.

It is an arithmetic number, because the mean of its divisors is an integer number (64156416).

Almost surely, 2^128312831 is an apocalyptic number.

128312831 is a deficient number, since it is larger than the sum of its proper divisors (1).

128312831 is an equidigital number, since it uses as much as digits as its factorization.

128312831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 128312831 is about 11327.5253696472. The cubic root of 128312831 is about 504.3786508992.

The spelling of 128312831 in words is "one hundred twenty-eight million, three hundred twelve thousand, eight hundred thirty-one".