215212505 has 8 divisors (see below), whose sum is σ = 258735624. Its totient is φ = 171849600.

The previous prime is 215212499. The next prime is 215212513. The reversal of 215212505 is 505212512.

It can be written as a sum of positive squares in 4 ways, for example, as 1263376 + 213949129 = 1124^2 + 14627^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215212505 - 2¹⁸ = 214950361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37076 + ... + 42485.

It is an arithmetic number, because the mean of its divisors is an integer number (32341953).

Almost surely, 2^215212505 is an apocalyptic number.

It is an amenable number.

215212505 is a deficient number, since it is larger than the sum of its proper divisors (43523119).

215212505 is an equidigital number, since it uses as much as digits as its factorization.

215212505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80107.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 215212505 is about 14670.1228692878. The cubic root of 215212505 is about 599.2699500350.

The spelling of 215212505 in words is "two hundred fifteen million, two hundred twelve thousand, five hundred five".