201520215 has 24 divisors (see below), whose sum is σ = 376172160. Its totient is φ = 99209664.

The previous prime is 201520199. The next prime is 201520219. The reversal of 201520215 is 512025102.

It is not a de Polignac number, because 201520215 - 2⁴ = 201520199 is a prime.

It is a super-2 number, since 2×201520215² = 81220794107292450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201520219) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 171655 + ... + 172824.

It is an arithmetic number, because the mean of its divisors is an integer number (15673840).

Almost surely, 2^201520215 is an apocalyptic number.

201520215 is a deficient number, since it is larger than the sum of its proper divisors (174651945).

201520215 is a wasteful number, since it uses less digits than its factorization.

201520215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344503 (or 344500 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 201520215 is about 14195.7815917265. The cubic root of 201520215 is about 586.2815210903.

Adding to 201520215 its reverse (512025102), we get a palindrome (713545317).

The spelling of 201520215 in words is "two hundred one million, five hundred twenty thousand, two hundred fifteen".