1209013 has 4 divisors (see below), whose sum is σ = 1302028. Its totient is φ = 1116000.

The previous prime is 1209007. The next prime is 1209017. The reversal of 1209013 is 3109021.

1209013 = 777² + 778².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3109021 = 31 ⋅100291.

It can be written as a sum of positive squares in 2 ways, for example, as 603729 + 605284 = 777^2 + 778^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1209013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46488 + ... + 46513.

It is an arithmetic number, because the mean of its divisors is an integer number (325507).

2^1209013 is an apocalyptic number.

1209013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1209013 is the 778-th centered square number.

It is an amenable number.

1209013 is a deficient number, since it is larger than the sum of its proper divisors (93015).

1209013 is an equidigital number, since it uses as much as digits as its factorization.

1209013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93014.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1209013 is about 1099.5512721106. The cubic root of 1209013 is about 106.5312419822.

The spelling of 1209013 in words is "one million, two hundred nine thousand, thirteen".