201211540 has 12 divisors (see below), whose sum is σ = 422544276. Its totient is φ = 80484608.

The previous prime is 201211531. The next prime is 201211547. The reversal of 201211540 is 45112102.

It can be written as a sum of positive squares in 2 ways, for example, as 22240656 + 178970884 = 4716^2 + 13378^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5030269 + ... + 5030308.

It is an arithmetic number, because the mean of its divisors is an integer number (35212023).

Almost surely, 2^201211540 is an apocalyptic number.

201211540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201211540 is an abundant number, since it is smaller than the sum of its proper divisors (221332736).

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

201211540 is a wasteful number, since it uses less digits than its factorization.

201211540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10060586 (or 10060584 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 201211540 is about 14184.9053574566. The cubic root of 201211540 is about 585.9820260303.

Adding to 201211540 its reverse (45112102), we get a palindrome (246323642).

The spelling of 201211540 in words is "two hundred one million, two hundred eleven thousand, five hundred forty".