901209 has 16 divisors (see below), whose sum is σ = 1291392. Its totient is φ = 557568.

The previous prime is 901207. The next prime is 901211. The reversal of 901209 is 902109.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (901207) and next prime (901211).

It is not a de Polignac number, because 901209 - 2¹ = 901207 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (901207) 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, 2377 + ... + 2729.

It is an arithmetic number, because the mean of its divisors is an integer number (80712).

2⁹⁰¹²⁰⁹ is an apocalyptic number.

It is an amenable number.

901209 is a deficient number, since it is larger than the sum of its proper divisors (390183).

901209 is a wasteful number, since it uses less digits than its factorization.

901209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 901209 is about 949.3202831500. The cubic root of 901209 is about 96.5921515856.

Subtracting 901209 from its reverse (902109), we obtain a square (900 = 30²).

The spelling of 901209 in words is "nine hundred one thousand, two hundred nine".