128985571 has 8 divisors (see below), whose sum is σ = 151535664. Its totient is φ = 108239520.

The previous prime is 128985551. The next prime is 128985581. The reversal of 128985571 is 175589821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128985571 - 2⁵ = 128985539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128985551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450856 + ... + 451141.

It is an arithmetic number, because the mean of its divisors is an integer number (18941958).

Almost surely, 2^128985571 is an apocalyptic number.

128985571 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128985571 is a deficient number, since it is larger than the sum of its proper divisors (22550093).

128985571 is a wasteful number, since it uses less digits than its factorization.

128985571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902021.

The product of its digits is 201600, while the sum is 46.

The square root of 128985571 is about 11357.1814725309. The cubic root of 128985571 is about 505.2585951344.

The spelling of 128985571 in words is "one hundred twenty-eight million, nine hundred eighty-five thousand, five hundred seventy-one".