201511215 has 24 divisors (see below), whose sum is σ = 350803440. Its totient is φ = 107005824.

The previous prime is 201511199. The next prime is 201511241. The reversal of 201511215 is 512115102.

It is not a de Polignac number, because 201511215 - 2⁴ = 201511199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 876 + ... + 20094.

It is an arithmetic number, because the mean of its divisors is an integer number (14616810).

Almost surely, 2^201511215 is an apocalyptic number.

201511215 is a deficient number, since it is larger than the sum of its proper divisors (149292225).

201511215 is a wasteful number, since it uses less digits than its factorization.

201511215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19463 (or 19460 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 201511215 is about 14195.4645926084. The cubic root of 201511215 is about 586.2727930788.

Adding to 201511215 its reverse (512115102), we get a palindrome (713626317).

The spelling of 201511215 in words is "two hundred one million, five hundred eleven thousand, two hundred fifteen".