201543540 has 48 divisors (see below), whose sum is σ = 615625920. Its totient is φ = 48858880.

The previous prime is 201543521. The next prime is 201543557. The reversal of 201543540 is 45345102.

It is a self number, because there is not a number n which added to its sum of digits gives 201543540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152025 + ... + 153344.

It is an arithmetic number, because the mean of its divisors is an integer number (12825540).

Almost surely, 2^201543540 is an apocalyptic number.

201543540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201543540 is an abundant number, since it is smaller than the sum of its proper divisors (414082380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201543540 is a wasteful number, since it uses less digits than its factorization.

201543540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305392 (or 305390 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 201543540 is about 14196.6031148300. The cubic root of 201543540 is about 586.3041399773.

Adding to 201543540 its reverse (45345102), we get a palindrome (246888642).

The spelling of 201543540 in words is "two hundred one million, five hundred forty-three thousand, five hundred forty".