655085217 has 4 divisors (see below), whose sum is σ = 873446960. Its totient is φ = 436723476.

The previous prime is 655085213. The next prime is 655085227. The reversal of 655085217 is 712580556.

655085217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 655085217 - 2² = 655085213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655085213) 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, 109180867 + ... + 109180872.

It is an arithmetic number, because the mean of its divisors is an integer number (218361740).

Almost surely, 2^655085217 is an apocalyptic number.

It is an amenable number.

655085217 is a deficient number, since it is larger than the sum of its proper divisors (218361743).

655085217 is a wasteful number, since it uses less digits than its factorization.

655085217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218361742.

The product of its (nonzero) digits is 84000, while the sum is 39.

The square root of 655085217 is about 25594.6325818520. The cubic root of 655085217 is about 868.4922212809.

The spelling of 655085217 in words is "six hundred fifty-five million, eighty-five thousand, two hundred seventeen".