1125535509 has 24 divisors (see below), whose sum is σ = 1955819840. Its totient is φ = 609311808.

The previous prime is 1125535493. The next prime is 1125535511. The reversal of 1125535509 is 9055355211.

1125535509 is a `hidden beast` number, since 112 + 5 + 5 + 35 + 509 = 666.

It is not a de Polignac number, because 1125535509 - 2⁴ = 1125535493 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 (1125535529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 468952 + ... + 471345.

Almost surely, 2^1125535509 is an apocalyptic number.

1125535509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1125535509 is a deficient number, since it is larger than the sum of its proper divisors (830284331).

1125535509 is a wasteful number, since it uses less digits than its factorization.

1125535509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940329 (or 940326 counting only the distinct ones).

The product of its (nonzero) digits is 33750, while the sum is 36.

The square root of 1125535509 is about 33549.0016095859. The cubic root of 1125535509 is about 1040.2069081056.

It can be divided in two parts, 11255 and 35509, that added together give a palindrome (46764).

The spelling of 1125535509 in words is "one billion, one hundred twenty-five million, five hundred thirty-five thousand, five hundred nine".