10031209 has 4 divisors (see below), whose sum is σ = 10076416. Its totient is φ = 9986004.

The previous prime is 10031191. The next prime is 10031227. The reversal of 10031209 is 90213001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90213001 = 5179 ⋅17419.

It is an interprime number because it is at equal distance from previous prime (10031191) and next prime (10031227).

It is a cyclic number.

It is not a de Polignac number, because 10031209 - 2¹¹ = 10029161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10031192 and 10031201.

It is not an unprimeable number, because it can be changed into a prime (10031299) 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, 22269 + ... + 22714.

It is an arithmetic number, because the mean of its divisors is an integer number (2519104).

Almost surely, 2^10031209 is an apocalyptic number.

It is an amenable number.

10031209 is a deficient number, since it is larger than the sum of its proper divisors (45207).

10031209 is an equidigital number, since it uses as much as digits as its factorization.

10031209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45206.

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

The square root of 10031209 is about 3167.2083922597. The cubic root of 10031209 is about 215.6673620893.

The spelling of 10031209 in words is "ten million, thirty-one thousand, two hundred nine".