201511915 has 16 divisors (see below), whose sum is σ = 264819456. Its totient is φ = 145986400.

The previous prime is 201511913. The next prime is 201511927. The reversal of 201511915 is 519115102.

It is a happy number.

201511915 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201511915 - 2¹ = 201511913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201511915.

It is not an unprimeable number, because it can be changed into a prime (201511913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7500 + ... + 21430.

It is an arithmetic number, because the mean of its divisors is an integer number (16551216).

Almost surely, 2^201511915 is an apocalyptic number.

201511915 is a deficient number, since it is larger than the sum of its proper divisors (63307541).

201511915 is a wasteful number, since it uses less digits than its factorization.

201511915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14210.

The product of its (nonzero) digits is 450, while the sum is 25.

The square root of 201511915 is about 14195.4892483493. The cubic root of 201511915 is about 586.2734719335.

The spelling of 201511915 in words is "two hundred one million, five hundred eleven thousand, nine hundred fifteen".