128655131 has 8 divisors (see below), whose sum is σ = 140464128. Its totient is φ = 116865000.

The previous prime is 128655119. The next prime is 128655139. The reversal of 128655131 is 131556821.

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

It is a cyclic number.

It is not a de Polignac number, because 128655131 - 2⁶ = 128655067 is a prime.

It is a super-2 number, since 2×128655131² = 33104285465254322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128655139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12206 + ... + 20156.

It is an arithmetic number, because the mean of its divisors is an integer number (17558016).

Almost surely, 2^128655131 is an apocalyptic number.

128655131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128655131 is a deficient number, since it is larger than the sum of its proper divisors (11808997).

128655131 is a wasteful number, since it uses less digits than its factorization.

128655131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9433.

The product of its digits is 7200, while the sum is 32.

The square root of 128655131 is about 11342.6245199248. The cubic root of 128655131 is about 504.8267627858.

The spelling of 128655131 in words is "one hundred twenty-eight million, six hundred fifty-five thousand, one hundred thirty-one".