1129161609 has 27 divisors (see below), whose sum is σ = 1708516173. Its totient is φ = 718566552.

The previous prime is 1129161599. The next prime is 1129161613. The reversal of 1129161609 is 9061619211.

The square root of 1129161609 is 33603.

It is a perfect power (a square), and thus also a powerful number.

1129161609 is a `hidden beast` number, since 11 + 29 + 1 + 616 + 0 + 9 = 666.

It is not a de Polignac number, because 1129161609 - 2²⁷ = 994943881 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1129161679) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2318364 + ... + 2318850.

Almost surely, 2^1129161609 is an apocalyptic number.

1129161609 is the 33603-rd square number.

1129161609 is the 16802-nd centered octagonal number.

It is an amenable number.

1129161609 is a deficient number, since it is larger than the sum of its proper divisors (579354564).

1129161609 is an frugal number, since it uses more digits than its factorization.

1129161609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026 (or 513 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The cubic root of 1129161609 is about 1041.3227772122.

Multiplying 1129161609 by its sum of digits (36), we get a square (40649817924 = 201618²).

It can be divided in two parts, 11291 and 61609, that added together give a square (72900 = 270²).

The spelling of 1129161609 in words is "one billion, one hundred twenty-nine million, one hundred sixty-one thousand, six hundred nine".