2191655 has 8 divisors (see below), whose sum is σ = 2694384. Its totient is φ = 1710400.

The previous prime is 2191633. The next prime is 2191687. The reversal of 2191655 is 5561912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2191655 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5141 + ... + 5550.

It is an arithmetic number, because the mean of its divisors is an integer number (336798).

2^2191655 is an apocalyptic number.

2191655 is a deficient number, since it is larger than the sum of its proper divisors (502729).

2191655 is a wasteful number, since it uses less digits than its factorization.

2191655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10737.

The product of its digits is 2700, while the sum is 29.

The square root of 2191655 is about 1480.4239257726. The cubic root of 2191655 is about 129.8944903270.

The spelling of 2191655 in words is "two million, one hundred ninety-one thousand, six hundred fifty-five".