128215331 has 2 divisors, whose sum is σ = 128215332. Its totient is φ = 128215330.

The previous prime is 128215303. The next prime is 128215369. The reversal of 128215331 is 133512821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128215331 is a prime.

It is a super-2 number, since 2×128215331² = 32878342206879122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128215331.

It is not a weakly prime, because it can be changed into another prime (128215391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64107665 + 64107666.

It is an arithmetic number, because the mean of its divisors is an integer number (64107666).

Almost surely, 2^128215331 is an apocalyptic number.

128215331 is a deficient number, since it is larger than the sum of its proper divisors (1).

128215331 is an equidigital number, since it uses as much as digits as its factorization.

128215331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 128215331 is about 11323.2208757049. The cubic root of 128215331 is about 504.2508658621.

The spelling of 128215331 in words is "one hundred twenty-eight million, two hundred fifteen thousand, three hundred thirty-one".