2191226 has 4 divisors (see below), whose sum is σ = 3286842. Its totient is φ = 1095612.

The previous prime is 2191199. The next prime is 2191229. The reversal of 2191226 is 6221912.

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

It can be written as a sum of positive squares in only one way, i.e., 1825201 + 366025 = 1351^2 + 605^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2191229) 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 as a sum of consecutive naturals, namely, 547805 + ... + 547808.

2^2191226 is an apocalyptic number.

2191226 is a deficient number, since it is larger than the sum of its proper divisors (1095616).

2191226 is a wasteful number, since it uses less digits than its factorization.

2191226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095615.

The product of its digits is 432, while the sum is 23.

The square root of 2191226 is about 1480.2790277512. The cubic root of 2191226 is about 129.8860144838.

The spelling of 2191226 in words is "two million, one hundred ninety-one thousand, two hundred twenty-six".