2195181 has 20 divisors (see below), whose sum is σ = 3364284. Its totient is φ = 1425600.

The previous prime is 2195177. The next prime is 2195191. The reversal of 2195181 is 1815912.

It can be written as a sum of positive squares in 2 ways, for example, as 826281 + 1368900 = 909^2 + 1170^2 .

It is not a de Polignac number, because 2195181 - 2² = 2195177 is a prime.

It is a super-2 number, since 2×2195181² = 9637639245522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2195191) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2991 + ... + 3651.

2^2195181 is an apocalyptic number.

It is an amenable number.

2195181 is a deficient number, since it is larger than the sum of its proper divisors (1169103).

2195181 is an equidigital number, since it uses as much as digits as its factorization.

2195181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 705 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 2195181 is about 1481.6143222850. The cubic root of 2195181 is about 129.9641123818.

The spelling of 2195181 in words is "two million, one hundred ninety-five thousand, one hundred eighty-one".