128065931 has 8 divisors (see below), whose sum is σ = 148842240. Its totient is φ = 107909928.

The previous prime is 128065921. The next prime is 128065933. The reversal of 128065931 is 139560821.

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

It is not a de Polignac number, because 128065931 - 2¹⁴ = 128049547 is a prime.

It is a super-2 number, since 2×128065931² = 32801765365793522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128065891 and 128065900.

It is not an unprimeable number, because it can be changed into a prime (128065933) 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, 154631 + ... + 155456.

It is an arithmetic number, because the mean of its divisors is an integer number (18605280).

Almost surely, 2^128065931 is an apocalyptic number.

128065931 is a deficient number, since it is larger than the sum of its proper divisors (20776309).

128065931 is an equidigital number, since it uses as much as digits as its factorization.

128065931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310153.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 128065931 is about 11316.6218899458. The cubic root of 128065931 is about 504.0549341209.

The spelling of 128065931 in words is "one hundred twenty-eight million, sixty-five thousand, nine hundred thirty-one".