2178791 has 2 divisors, whose sum is σ = 2178792. Its totient is φ = 2178790.

The previous prime is 2178763. The next prime is 2178797. The reversal of 2178791 is 1978712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2178791 - 2¹⁰ = 2177767 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2178797) 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, 1089395 + 1089396.

It is an arithmetic number, because the mean of its divisors is an integer number (1089396).

2^2178791 is an apocalyptic number.

2178791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2178791 is an equidigital number, since it uses as much as digits as its factorization.

2178791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 35.

The square root of 2178791 is about 1476.0728301815. The cubic root of 2178791 is about 129.6398513008.

The spelling of 2178791 in words is "two million, one hundred seventy-eight thousand, seven hundred ninety-one".