201545 has 8 divisors (see below), whose sum is σ = 244296. Its totient is φ = 159616.

The previous prime is 201517. The next prime is 201547. The reversal of 201545 is 545102.

It can be written as a sum of positive squares in 4 ways, for example, as 30976 + 170569 = 176^2 + 413^2 .

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 201545 - 2¹⁴ = 185161 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (201547) 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, 749 + ... + 981.

It is an arithmetic number, because the mean of its divisors is an integer number (30537).

2²⁰¹⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

201545 is a deficient number, since it is larger than the sum of its proper divisors (42751).

201545 is a wasteful number, since it uses less digits than its factorization.

201545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 201545 is about 448.9376348670. The cubic root of 201545 is about 58.6305555721.

Adding to 201545 its reverse (545102), we get a palindrome (746647).

The spelling of 201545 in words is "two hundred one thousand, five hundred forty-five".