1155609 has 48 divisors (see below), whose sum is σ = 2201472. Its totient is φ = 566784.

The previous prime is 1155607. The next prime is 1155611. The reversal of 1155609 is 9065511.

1155609 is a `hidden beast` number, since 1 + 1 + 55 + 609 = 666.

It is an interprime number because it is at equal distance from previous prime (1155607) and next prime (1155611).

It is not a de Polignac number, because 1155609 - 2¹ = 1155607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155601) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13882 + ... + 13964.

It is an arithmetic number, because the mean of its divisors is an integer number (45864).

2^1155609 is an apocalyptic number.

It is an amenable number.

1155609 is a deficient number, since it is larger than the sum of its proper divisors (1045863).

1155609 is a wasteful number, since it uses less digits than its factorization.

1155609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 1155609 is about 1074.9925581138. The cubic root of 1155609 is about 104.9390122020.

It can be divided in two parts, 1155 and 609, that added together give a square (1764 = 42²).

The spelling of 1155609 in words is "one million, one hundred fifty-five thousand, six hundred nine".