201509 has 8 divisors (see below), whose sum is σ = 251328. Its totient is φ = 156960.

The previous prime is 201499. The next prime is 201511. The reversal of 201509 is 905102.

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 201509 - 2⁴ = 201493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1232 + ... + 1385.

It is an arithmetic number, because the mean of its divisors is an integer number (31416).

2²⁰¹⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

201509 is a deficient number, since it is larger than the sum of its proper divisors (49819).

201509 is a wasteful number, since it uses less digits than its factorization.

201509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 201509 is about 448.8975384205. The cubic root of 201509 is about 58.6270644978.

Multiplying 201509 by its sum of digits (17), we get a triangular number (3425653 = T₂₆₁₇).

The spelling of 201509 in words is "two hundred one thousand, five hundred nine".