2191694 has 4 divisors (see below), whose sum is σ = 3287544. Its totient is φ = 1095846.

The previous prime is 2191687. The next prime is 2191703. The reversal of 2191694 is 4961912.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2191694.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547922 + ... + 547925.

It is an arithmetic number, because the mean of its divisors is an integer number (821886).

2^2191694 is an apocalyptic number.

2191694 is a deficient number, since it is larger than the sum of its proper divisors (1095850).

2191694 is a wasteful number, since it uses less digits than its factorization.

2191694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095849.

The product of its digits is 3888, while the sum is 32.

The square root of 2191694 is about 1480.4370976168. The cubic root of 2191694 is about 129.8952608034.

The spelling of 2191694 in words is "two million, one hundred ninety-one thousand, six hundred ninety-four".