201542540 has 12 divisors (see below), whose sum is σ = 423239376. Its totient is φ = 80617008.

The previous prime is 201542527. The next prime is 201542581. The reversal of 201542540 is 45245102.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5038544 + ... + 5038583.

It is an arithmetic number, because the mean of its divisors is an integer number (35269948).

Almost surely, 2^201542540 is an apocalyptic number.

201542540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201542540 is an abundant number, since it is smaller than the sum of its proper divisors (221696836).

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

201542540 is a wasteful number, since it uses less digits than its factorization.

201542540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10077136 (or 10077134 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 201542540 is about 14196.5678950935. The cubic root of 201542540 is about 586.3031702859.

Adding to 201542540 its reverse (45245102), we get a palindrome (246787642).

The spelling of 201542540 in words is "two hundred one million, five hundred forty-two thousand, five hundred forty".