1125340409 has 4 divisors (see below), whose sum is σ = 1125924516. Its totient is φ = 1124756304.

The previous prime is 1125340399. The next prime is 1125340439. The reversal of 1125340409 is 9040435211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9040435211 = 97 ⋅93200363.

It can be written as a sum of positive squares in 2 ways, for example, as 1025280400 + 100060009 = 32020^2 + 10003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1125340409 is a prime.

It is a super-2 number, since 2×1125340409² = 2532782072256574562, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1125340439) 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, 289154 + ... + 293019.

It is an arithmetic number, because the mean of its divisors is an integer number (281481129).

Almost surely, 2^1125340409 is an apocalyptic number.

It is an amenable number.

1125340409 is a deficient number, since it is larger than the sum of its proper divisors (584107).

1125340409 is an equidigital number, since it uses as much as digits as its factorization.

1125340409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584106.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1125340409 is about 33546.0937964467. The cubic root of 1125340409 is about 1040.1468015775.

The spelling of 1125340409 in words is "one billion, one hundred twenty-five million, three hundred forty thousand, four hundred nine".