201915 has 24 divisors (see below), whose sum is σ = 400608. Its totient is φ = 92160.

The previous prime is 201911. The next prime is 201919. The reversal of 201915 is 519102.

It is an interprime number because it is at equal distance from previous prime (201911) and next prime (201919).

It is not a de Polignac number, because 201915 - 2² = 201911 is a prime.

201915 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (201911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6 + ... + 635.

It is an arithmetic number, because the mean of its divisors is an integer number (16692).

2²⁰¹⁹¹⁵ is an apocalyptic number.

201915 is a deficient number, since it is larger than the sum of its proper divisors (198693).

201915 is a wasteful number, since it uses less digits than its factorization.

201915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 201915 is about 449.3495298762. The cubic root of 201915 is about 58.6664119881. Note that the first 3 decimals are identical.

The spelling of 201915 in words is "two hundred one thousand, nine hundred fifteen".