128948231 has 4 divisors (see below), whose sum is σ = 135735000. Its totient is φ = 122161464.

The previous prime is 128948221. The next prime is 128948243. The reversal of 128948231 is 132849821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132849821 = 13 ⋅10219217.

It is a cyclic number.

It is not a de Polignac number, because 128948231 - 2¹⁰ = 128947207 is a prime.

It is a super-2 number, since 2×128948231² = 33255292556058722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128948221) 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, 3393356 + ... + 3393393.

It is an arithmetic number, because the mean of its divisors is an integer number (33933750).

Almost surely, 2^128948231 is an apocalyptic number.

128948231 is a deficient number, since it is larger than the sum of its proper divisors (6786769).

128948231 is an equidigital number, since it uses as much as digits as its factorization.

128948231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6786768.

The product of its digits is 27648, while the sum is 38.

The square root of 128948231 is about 11355.5374597594. The cubic root of 128948231 is about 505.2098347017.

The spelling of 128948231 in words is "one hundred twenty-eight million, nine hundred forty-eight thousand, two hundred thirty-one".