1125404509 has 4 divisors (see below), whose sum is σ = 1125994716. Its totient is φ = 1124814304.

The previous prime is 1125404459. The next prime is 1125404521. The reversal of 1125404509 is 9054045211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1086691225 + 38713284 = 32965^2 + 6222^2 .

It is a cyclic number.

It is not a de Polignac number, because 1125404509 - 2⁷ = 1125404381 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 (1125404549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292234 + ... + 296059.

It is an arithmetic number, because the mean of its divisors is an integer number (281498679).

Almost surely, 2^1125404509 is an apocalyptic number.

It is an amenable number.

1125404509 is a deficient number, since it is larger than the sum of its proper divisors (590207).

1125404509 is an equidigital number, since it uses as much as digits as its factorization.

1125404509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590206.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1125404509 is about 33547.0491846899. The cubic root of 1125404509 is about 1040.1665503112.

The spelling of 1125404509 in words is "one billion, one hundred twenty-five million, four hundred four thousand, five hundred nine".