128505113 has 32 divisors (see below), whose sum is σ = 153753600. Its totient is φ = 106142400.

The previous prime is 128505109. The next prime is 128505121. The reversal of 128505113 is 311505821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 128505113 - 2² = 128505109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128505413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 709883 + ... + 710063.

It is an arithmetic number, because the mean of its divisors is an integer number (4804800).

Almost surely, 2^128505113 is an apocalyptic number.

It is an amenable number.

128505113 is a deficient number, since it is larger than the sum of its proper divisors (25248487).

128505113 is a wasteful number, since it uses less digits than its factorization.

128505113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 128505113 is about 11336.0095712733. The cubic root of 128505113 is about 504.6304691338.

The spelling of 128505113 in words is "one hundred twenty-eight million, five hundred five thousand, one hundred thirteen".