215001 has 8 divisors (see below), whose sum is σ = 318560. Its totient is φ = 143316.

The previous prime is 214993. The next prime is 215051. The reversal of 215001 is 100512.

It is a happy number.

It is not a de Polignac number, because 215001 - 2³ = 214993 is a prime.

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

It is a Duffinian number.

215001 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (215051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3955 + ... + 4008.

It is an arithmetic number, because the mean of its divisors is an integer number (39820).

2²¹⁵⁰⁰¹ is an apocalyptic number.

It is an amenable number.

215001 is a deficient number, since it is larger than the sum of its proper divisors (103559).

215001 is an equidigital number, since it uses as much as digits as its factorization.

215001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7972 (or 7966 counting only the distinct ones).

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

The square root of 215001 is about 463.6820031013. The cubic root of 215001 is about 59.9073570283.

Adding to 215001 its reverse (100512), we get a palindrome (315513).

The spelling of 215001 in words is "two hundred fifteen thousand, one".