128752331 has 4 divisors (see below), whose sum is σ = 132905664. Its totient is φ = 124599000.

The previous prime is 128752319. The next prime is 128752333. The reversal of 128752331 is 133257821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128752331 is a prime.

It is a super-2 number, since 2×128752331² = 33154325475867122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128752333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2076620 + ... + 2076681.

It is an arithmetic number, because the mean of its divisors is an integer number (33226416).

Almost surely, 2^128752331 is an apocalyptic number.

128752331 is a deficient number, since it is larger than the sum of its proper divisors (4153333).

128752331 is an equidigital number, since it uses as much as digits as its factorization.

128752331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4153332.

The product of its digits is 10080, while the sum is 32.

The square root of 128752331 is about 11346.9084335778. The cubic root of 128752331 is about 504.9538643603.

The spelling of 128752331 in words is "one hundred twenty-eight million, seven hundred fifty-two thousand, three hundred thirty-one".