215032505 has 4 divisors (see below), whose sum is σ = 258039012. Its totient is φ = 172026000.

The previous prime is 215032487. The next prime is 215032513. The reversal of 215032505 is 505230512.

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 59182249 + 155850256 = 7693^2 + 12484^2 .

It is not a de Polignac number, because 215032505 - 2²⁰ = 213983929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21503246 + ... + 21503255.

It is an arithmetic number, because the mean of its divisors is an integer number (64509753).

Almost surely, 2^215032505 is an apocalyptic number.

It is an amenable number.

215032505 is a deficient number, since it is larger than the sum of its proper divisors (43006507).

215032505 is an equidigital number, since it uses as much as digits as its factorization.

215032505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43006506.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 215032505 is about 14663.9866680245. The cubic root of 215032505 is about 599.1028304429.

The spelling of 215032505 in words is "two hundred fifteen million, thirty-two thousand, five hundred five".