2217155 has 4 divisors (see below), whose sum is σ = 2660592. Its totient is φ = 1773720.

The previous prime is 2217143. The next prime is 2217181. The reversal of 2217155 is 5517122.

It is a happy number.

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

It is not a de Polignac number, because 2217155 - 2¹⁴ = 2200771 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2217155.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221711 + ... + 221720.

It is an arithmetic number, because the mean of its divisors is an integer number (665148).

2^2217155 is an apocalyptic number.

2217155 is a deficient number, since it is larger than the sum of its proper divisors (443437).

2217155 is an equidigital number, since it uses as much as digits as its factorization.

2217155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443436.

The product of its digits is 700, while the sum is 23.

The square root of 2217155 is about 1489.0114170147. The cubic root of 2217155 is about 130.3963250310.

The spelling of 2217155 in words is "two million, two hundred seventeen thousand, one hundred fifty-five".