128862817 has 2 divisors, whose sum is σ = 128862818. Its totient is φ = 128862816.

The previous prime is 128862803. The next prime is 128862821. The reversal of 128862817 is 718268821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92332881 + 36529936 = 9609^2 + 6044^2 .

It is a cyclic number.

It is not a de Polignac number, because 128862817 - 2²³ = 120474209 is a prime.

It is not a weakly prime, because it can be changed into another prime (128862857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64431408 + 64431409.

It is an arithmetic number, because the mean of its divisors is an integer number (64431409).

Almost surely, 2^128862817 is an apocalyptic number.

It is an amenable number.

128862817 is a deficient number, since it is larger than the sum of its proper divisors (1).

128862817 is an equidigital number, since it uses as much as digits as its factorization.

128862817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 43.

The square root of 128862817 is about 11351.7759403540. The cubic root of 128862817 is about 505.0982614401.

The spelling of 128862817 in words is "one hundred twenty-eight million, eight hundred sixty-two thousand, eight hundred seventeen".