215552005 has 4 divisors (see below), whose sum is σ = 258662412. Its totient is φ = 172441600.

The previous prime is 215552003. The next prime is 215552033. The reversal of 215552005 is 500255512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29311396 + 186240609 = 5414^2 + 13647^2 .

It is not a de Polignac number, because 215552005 - 2¹ = 215552003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215552003) 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, 21555196 + ... + 21555205.

It is an arithmetic number, because the mean of its divisors is an integer number (64665603).

Almost surely, 2^215552005 is an apocalyptic number.

It is an amenable number.

215552005 is a deficient number, since it is larger than the sum of its proper divisors (43110407).

215552005 is an equidigital number, since it uses as much as digits as its factorization.

215552005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43110406.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 215552005 is about 14681.6894463818. The cubic root of 215552005 is about 599.5849027048.

The spelling of 215552005 in words is "two hundred fifteen million, five hundred fifty-two thousand, five".