128816273 has 2 divisors, whose sum is σ = 128816274. Its totient is φ = 128816272.

The previous prime is 128816269. The next prime is 128816287. The reversal of 128816273 is 372618821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121374289 + 7441984 = 11017^2 + 2728^2 .

It is a cyclic number.

It is not a de Polignac number, because 128816273 - 2² = 128816269 is a prime.

It is a super-2 number, since 2×128816273² = 33187264379221058, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (128816213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64408136 + 64408137.

It is an arithmetic number, because the mean of its divisors is an integer number (64408137).

Almost surely, 2^128816273 is an apocalyptic number.

It is an amenable number.

128816273 is a deficient number, since it is larger than the sum of its proper divisors (1).

128816273 is an equidigital number, since it uses as much as digits as its factorization.

128816273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 38.

The square root of 128816273 is about 11349.7256795043. The cubic root of 128816273 is about 505.0374419189.

The spelling of 128816273 in words is "one hundred twenty-eight million, eight hundred sixteen thousand, two hundred seventy-three".