215145201 has 4 divisors (see below), whose sum is σ = 286860272. Its totient is φ = 143430132.

The previous prime is 215145199. The next prime is 215145209. The reversal of 215145201 is 102541512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 215145201 - 2¹ = 215145199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215145209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35857531 + ... + 35857536.

It is an arithmetic number, because the mean of its divisors is an integer number (71715068).

Almost surely, 2^215145201 is an apocalyptic number.

It is an amenable number.

215145201 is a deficient number, since it is larger than the sum of its proper divisors (71715071).

215145201 is an equidigital number, since it uses as much as digits as its factorization.

215145201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71715070.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 215145201 is about 14667.8287759300. The cubic root of 215145201 is about 599.2074730738.

Adding to 215145201 its reverse (102541512), we get a palindrome (317686713).

The spelling of 215145201 in words is "two hundred fifteen million, one hundred forty-five thousand, two hundred one".