1125864209 has 8 divisors (see below), whose sum is σ = 1186103040. Its totient is φ = 1065723696.

The previous prime is 1125864203. The next prime is 1125864211. The reversal of 1125864209 is 9024685211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1125864209 - 2⁴ = 1125864193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1125864203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449 + ... + 47454.

It is an arithmetic number, because the mean of its divisors is an integer number (148262880).

Almost surely, 2^1125864209 is an apocalyptic number.

1125864209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1125864209 is a deficient number, since it is larger than the sum of its proper divisors (60238831).

1125864209 is a wasteful number, since it uses less digits than its factorization.

1125864209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49159.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 1125864209 is about 33553.9000564763. The cubic root of 1125864209 is about 1040.3081584968.

The spelling of 1125864209 in words is "one billion, one hundred twenty-five million, eight hundred sixty-four thousand, two hundred nine".