128161331 has 2 divisors, whose sum is σ = 128161332. Its totient is φ = 128161330.

The previous prime is 128161309. The next prime is 128161357. The reversal of 128161331 is 133161821.

It is an a-pointer prime, because the next prime (128161357) can be obtained adding 128161331 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128161331 is a prime.

It is a super-2 number, since 2×128161331² = 32850653527383122, which contains 22 as substring.

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 128161331.

It is not a weakly prime, because it can be changed into another prime (128161381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64080665 + 64080666.

It is an arithmetic number, because the mean of its divisors is an integer number (64080666).

Almost surely, 2^128161331 is an apocalyptic number.

128161331 is a deficient number, since it is larger than the sum of its proper divisors (1).

128161331 is an equidigital number, since it uses as much as digits as its factorization.

128161331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 128161331 is about 11320.8361440311. The cubic root of 128161331 is about 504.1800647336.

The spelling of 128161331 in words is "one hundred twenty-eight million, one hundred sixty-one thousand, three hundred thirty-one".