201242509 has 8 divisors (see below), whose sum is σ = 228129440. Its totient is φ = 175985136.

The previous prime is 201242507. The next prime is 201242521. The reversal of 201242509 is 905242102.

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 201242509 - 2¹ = 201242507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201242507) 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, 407127 + ... + 407620.

It is an arithmetic number, because the mean of its divisors is an integer number (28516180).

Almost surely, 2^201242509 is an apocalyptic number.

It is an amenable number.

201242509 is a deficient number, since it is larger than the sum of its proper divisors (26886931).

201242509 is a wasteful number, since it uses less digits than its factorization.

201242509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814779.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 201242509 is about 14185.9969335962. The cubic root of 201242509 is about 586.0120878355.

It can be divided in two parts, 2012 and 42509, that added together give a square (44521 = 211²).

The spelling of 201242509 in words is "two hundred one million, two hundred forty-two thousand, five hundred nine".