1209125 has 16 divisors (see below), whose sum is σ = 1600560. Its totient is φ = 908800.

The previous prime is 1209121. The next prime is 1209139. The reversal of 1209125 is 5219021.

It can be written as a sum of positive squares in 8 ways, for example, as 432964 + 776161 = 658^2 + 881^2 .

It is not a de Polignac number, because 1209125 - 2² = 1209121 is a prime.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 1209097 and 1209106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1841 + ... + 2409.

It is an arithmetic number, because the mean of its divisors is an integer number (100035).

2^1209125 is an apocalyptic number.

It is an amenable number.

1209125 is a deficient number, since it is larger than the sum of its proper divisors (391435).

1209125 is an equidigital number, since it uses as much as digits as its factorization.

1209125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1209125 is about 1099.6022007981. The cubic root of 1209125 is about 106.5345314783.

The spelling of 1209125 in words is "one million, two hundred nine thousand, one hundred twenty-five".