128316281 has 2 divisors, whose sum is σ = 128316282. Its totient is φ = 128316280.

The previous prime is 128316263. The next prime is 128316301. The reversal of 128316281 is 182613821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115777600 + 12538681 = 10760^2 + 3541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128316281 is a prime.

It is a super-2 number, since 2×128316281² = 32930135939341922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128316581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64158140 + 64158141.

It is an arithmetic number, because the mean of its divisors is an integer number (64158141).

Almost surely, 2^128316281 is an apocalyptic number.

It is an amenable number.

128316281 is a deficient number, since it is larger than the sum of its proper divisors (1).

128316281 is an equidigital number, since it uses as much as digits as its factorization.

128316281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 128316281 is about 11327.6776525464. The cubic root of 128316281 is about 504.3831713376.

The spelling of 128316281 in words is "one hundred twenty-eight million, three hundred sixteen thousand, two hundred eighty-one".