128242331 has 4 divisors (see below), whose sum is σ = 146562672. Its totient is φ = 109921992.

The previous prime is 128242327. The next prime is 128242357. The reversal of 128242331 is 133242821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133242821 = 17 ⋅7837813.

It is a cyclic number.

It is not a de Polignac number, because 128242331 - 2² = 128242327 is a prime.

It is a super-2 number, since 2×128242331² = 32892190920627122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128242331.

It is not an unprimeable number, because it can be changed into a prime (128242391) 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, 9160160 + ... + 9160173.

It is an arithmetic number, because the mean of its divisors is an integer number (36640668).

Almost surely, 2^128242331 is an apocalyptic number.

128242331 is a deficient number, since it is larger than the sum of its proper divisors (18320341).

128242331 is an equidigital number, since it uses as much as digits as its factorization.

128242331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18320340.

The product of its digits is 2304, while the sum is 26.

The square root of 128242331 is about 11324.4130532227. The cubic root of 128242331 is about 504.2862589718.

The spelling of 128242331 in words is "one hundred twenty-eight million, two hundred forty-two thousand, three hundred thirty-one".