128551229 has 8 divisors (see below), whose sum is σ = 140807160. Its totient is φ = 116816896.

The previous prime is 128551219. The next prime is 128551237. The reversal of 128551229 is 922155821.

It can be written as a sum of positive squares in 4 ways, for example, as 62568100 + 65983129 = 7910^2 + 8123^2 .

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 128551229 - 2²⁰ = 127502653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128551219) 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, 129884 + ... + 130869.

It is an arithmetic number, because the mean of its divisors is an integer number (17600895).

Almost surely, 2^128551229 is an apocalyptic number.

It is an amenable number.

128551229 is a deficient number, since it is larger than the sum of its proper divisors (12255931).

128551229 is a wasteful number, since it uses less digits than its factorization.

128551229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260799.

The product of its digits is 14400, while the sum is 35.

The square root of 128551229 is about 11338.0434379129. The cubic root of 128551229 is about 504.6908266686.

The spelling of 128551229 in words is "one hundred twenty-eight million, five hundred fifty-one thousand, two hundred twenty-nine".