128570389 has 2 divisors, whose sum is σ = 128570390. Its totient is φ = 128570388.

The previous prime is 128570353. The next prime is 128570401. The reversal of 128570389 is 983075821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126562500 + 2007889 = 11250^2 + 1417^2 .

It is a cyclic number.

It is not a de Polignac number, because 128570389 - 2⁷ = 128570261 is a prime.

It is a super-2 number, since 2×128570389² = 33060689855222642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128570329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64285194 + 64285195.

It is an arithmetic number, because the mean of its divisors is an integer number (64285195).

Almost surely, 2^128570389 is an apocalyptic number.

It is an amenable number.

128570389 is a deficient number, since it is larger than the sum of its proper divisors (1).

128570389 is an equidigital number, since it uses as much as digits as its factorization.

128570389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 128570389 is about 11338.8883493930. Note that the first 3 decimals coincide. The cubic root of 128570389 is about 504.7158994118.

The spelling of 128570389 in words is "one hundred twenty-eight million, five hundred seventy thousand, three hundred eighty-nine".