1128909609 has 16 divisors (see below), whose sum is σ = 1726410240. Its totient is φ = 728328240.

The previous prime is 1128909601. The next prime is 1128909611. The reversal of 1128909609 is 9069098211.

1128909609 is a `hidden beast` number, since 11 + 28 + 9 + 0 + 9 + 609 = 666.

It is not a de Polignac number, because 1128909609 - 2³ = 1128909601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1128909601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 673542 + ... + 675215.

It is an arithmetic number, because the mean of its divisors is an integer number (107900640).

Almost surely, 2^1128909609 is an apocalyptic number.

It is an amenable number.

1128909609 is a deficient number, since it is larger than the sum of its proper divisors (597500631).

1128909609 is a wasteful number, since it uses less digits than its factorization.

1128909609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348797 (or 1348791 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 1128909609 is about 33599.2501255608. The cubic root of 1128909609 is about 1041.2453059091.

The spelling of 1128909609 in words is "one billion, one hundred twenty-eight million, nine hundred nine thousand, six hundred nine".