2191266 has 128 divisors (see below), whose sum is σ = 6635520. Its totient is φ = 518400.

The previous prime is 2191261. The next prime is 2191291. The reversal of 2191266 is 6621912.

2191266 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2191261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 70671 + ... + 70701.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2^2191266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2191266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3317760).

2191266 is an abundant number, since it is smaller than the sum of its proper divisors (4444254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2191266 is a wasteful number, since it uses less digits than its factorization.

2191266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77 (or 71 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 2191266 is about 1480.2925386558. The cubic root of 2191266 is about 129.8868048190.

It can be divided in two parts, 219 and 1266, that added together give a triangular number (1485 = T₅₄).

The spelling of 2191266 in words is "two million, one hundred ninety-one thousand, two hundred sixty-six".