201215530 has 16 divisors (see below), whose sum is σ = 362364840. Its totient is φ = 80446912.

The previous prime is 201215527. The next prime is 201215549. The reversal of 201215530 is 35512102.

It can be written as a sum of positive squares in 4 ways, for example, as 194574601 + 6640929 = 13949^2 + 2577^2 .

It is a junction number, because it is equal to n+sod(n) for n = 201215498 and 201215507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25632 + ... + 32548.

Almost surely, 2^201215530 is an apocalyptic number.

201215530 is a deficient number, since it is larger than the sum of its proper divisors (161149310).

201215530 is a wasteful number, since it uses less digits than its factorization.

201215530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9833.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 201215530 is about 14185.0459992204. The cubic root of 201215530 is about 585.9858993217.

Adding to 201215530 its reverse (35512102), we get a palindrome (236727632).

It can be divided in two parts, 20121 and 5530, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 201215530 in words is "two hundred one million, two hundred fifteen thousand, five hundred thirty".