1128129409 has 8 divisors (see below), whose sum is σ = 1235038752. Its totient is φ = 1021945440.

The previous prime is 1128129407. The next prime is 1128129449. The reversal of 1128129409 is 9049218211.

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 1128129409 - 2¹ = 1128129407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128129407) 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, 178084 + ... + 184309.

It is an arithmetic number, because the mean of its divisors is an integer number (154379844).

Almost surely, 2^1128129409 is an apocalyptic number.

It is an amenable number.

1128129409 is a deficient number, since it is larger than the sum of its proper divisors (106909343).

1128129409 is a wasteful number, since it uses less digits than its factorization.

1128129409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362687.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1128129409 is about 33587.6377406926. The cubic root of 1128129409 is about 1041.0053791690.

It can be divided in two parts, 112812 and 9409, that added together give a palindrome (122221).

The spelling of 1128129409 in words is "one billion, one hundred twenty-eight million, one hundred twenty-nine thousand, four hundred nine".