2215771 has 8 divisors (see below), whose sum is σ = 2286144. Its totient is φ = 2146560.

The previous prime is 2215699. The next prime is 2215777. The reversal of 2215771 is 1775122.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2215771 - 2²¹ = 118619 is a prime.

It is a super-2 number, since 2×2215771² = 9819282248882, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2²⁰ + 2²⁰ + 1 + 5⁴ + 7³ + 7⁶ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2215777) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4926 + ... + 5356.

It is an arithmetic number, because the mean of its divisors is an integer number (285768).

2^2215771 is an apocalyptic number.

2215771 is a deficient number, since it is larger than the sum of its proper divisors (70373).

2215771 is an equidigital number, since it uses as much as digits as its factorization.

2215771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581.

The product of its digits is 980, while the sum is 25.

The square root of 2215771 is about 1488.5466065932. The cubic root of 2215771 is about 130.3691872384.

The spelling of 2215771 in words is "two million, two hundred fifteen thousand, seven hundred seventy-one".