2215181 has 2 divisors, whose sum is σ = 2215182. Its totient is φ = 2215180.

The previous prime is 2215177. The next prime is 2215193. The reversal of 2215181 is 1815122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1359556 + 855625 = 1166^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215181 - 2² = 2215177 is a prime.

It is a super-3 number, since 3×2215181³ = 32609858018633324223, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is equal to p₁₆₃₇₀₃ and since 2215181 and 163703 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2215111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1107590 + 1107591.

It is an arithmetic number, because the mean of its divisors is an integer number (1107591).

2^2215181 is an apocalyptic number.

It is an amenable number.

2215181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2215181 is an equidigital number, since it uses as much as digits as its factorization.

2215181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 160, while the sum is 20.

The square root of 2215181 is about 1488.3484135108. The cubic root of 2215181 is about 130.3576149461.

The spelling of 2215181 in words is "two million, two hundred fifteen thousand, one hundred eighty-one".