201143545 has 4 divisors (see below), whose sum is σ = 241372260. Its totient is φ = 160914832.

The previous prime is 201143539. The next prime is 201143549. The reversal of 201143545 is 545341102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88868329 + 112275216 = 9427^2 + 10596^2 .

It is a cyclic number.

It is not a de Polignac number, because 201143545 - 2¹¹ = 201141497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201143549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20114350 + ... + 20114359.

It is an arithmetic number, because the mean of its divisors is an integer number (60343065).

Almost surely, 2^201143545 is an apocalyptic number.

It is an amenable number.

201143545 is a deficient number, since it is larger than the sum of its proper divisors (40228715).

201143545 is an equidigital number, since it uses as much as digits as its factorization.

201143545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40228714.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 201143545 is about 14182.5084170608. The cubic root of 201143545 is about 585.9160120286.

Adding to 201143545 its reverse (545341102), we get a palindrome (746484647).

The spelling of 201143545 in words is "two hundred one million, one hundred forty-three thousand, five hundred forty-five".