128956571 has 2 divisors, whose sum is σ = 128956572. Its totient is φ = 128956570.

The previous prime is 128956549. The next prime is 128956589. The reversal of 128956571 is 175659821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128956571 - 2¹⁸ = 128694427 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128956511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64478285 + 64478286.

It is an arithmetic number, because the mean of its divisors is an integer number (64478286).

Almost surely, 2^128956571 is an apocalyptic number.

128956571 is a deficient number, since it is larger than the sum of its proper divisors (1).

128956571 is an equidigital number, since it uses as much as digits as its factorization.

128956571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 44.

The square root of 128956571 is about 11355.9046755421. The cubic root of 128956571 is about 505.2207263056.

The spelling of 128956571 in words is "one hundred twenty-eight million, nine hundred fifty-six thousand, five hundred seventy-one".