2191172 has 12 divisors (see below), whose sum is σ = 3852156. Its totient is φ = 1090560.

The previous prime is 2191171. The next prime is 2191193. The reversal of 2191172 is 2711912.

It can be written as a sum of positive squares in 2 ways, for example, as 1811716 + 379456 = 1346^2 + 616^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2191171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173 + ... + 2100.

It is an arithmetic number, because the mean of its divisors is an integer number (321013).

2^2191172 is an apocalyptic number.

It is an amenable number.

2191172 is a deficient number, since it is larger than the sum of its proper divisors (1660984).

2191172 is a wasteful number, since it uses less digits than its factorization.

2191172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2518 (or 2516 counting only the distinct ones).

The product of its digits is 252, while the sum is 23.

The square root of 2191172 is about 1480.2607878344. The cubic root of 2191172 is about 129.8849475161.

The spelling of 2191172 in words is "two million, one hundred ninety-one thousand, one hundred seventy-two".