201500001 has 16 divisors (see below), whose sum is σ = 300528000. Its totient is φ = 133429104.

The previous prime is 201499999. The next prime is 201500003. The reversal of 201500001 is 100005102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (201499999) and next prime (201500003).

It is not a de Polignac number, because 201500001 - 2¹ = 201499999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (201500003) 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, 21021 + ... + 29066.

It is an arithmetic number, because the mean of its divisors is an integer number (18783000).

Almost surely, 2^201500001 is an apocalyptic number.

It is an amenable number.

201500001 is a deficient number, since it is larger than the sum of its proper divisors (99027999).

201500001 is a wasteful number, since it uses less digits than its factorization.

201500001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50245 (or 50239 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 201500001 is about 14195.0696018019. The cubic root of 201500001 is about 586.2619176129.

Adding to 201500001 its reverse (100005102), we get a palindrome (301505103).

The spelling of 201500001 in words is "two hundred one million, five hundred thousand, one".