2186091 has 12 divisors (see below), whose sum is σ = 3217968. Its totient is φ = 1429584.

The previous prime is 2186087. The next prime is 2186099. The reversal of 2186091 is 1906812.

It is not a de Polignac number, because 2186091 - 2² = 2186087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2186099) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1815 + ... + 2768.

It is an arithmetic number, because the mean of its divisors is an integer number (268164).

2^2186091 is an apocalyptic number.

2186091 is a deficient number, since it is larger than the sum of its proper divisors (1031877).

2186091 is a wasteful number, since it uses less digits than its factorization.

2186091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4642 (or 4639 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 2186091 is about 1478.5435401097. The cubic root of 2186091 is about 129.7844752298.

The spelling of 2186091 in words is "two million, one hundred eighty-six thousand, ninety-one".