2186491 has 2 divisors, whose sum is σ = 2186492. Its totient is φ = 2186490.

The previous prime is 2186473. The next prime is 2186519. The reversal of 2186491 is 1946812.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2186491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2186291) 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, 1093245 + 1093246.

It is an arithmetic number, because the mean of its divisors is an integer number (1093246).

2^2186491 is an apocalyptic number.

2186491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2186491 is an equidigital number, since it uses as much as digits as its factorization.

2186491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 31.

The square root of 2186491 is about 1478.6788021744. The cubic root of 2186491 is about 129.7923905185.

The spelling of 2186491 in words is "two million, one hundred eighty-six thousand, four hundred ninety-one".