2185191 has 8 divisors (see below), whose sum is σ = 3237360. Its totient is φ = 1456776.

The previous prime is 2185189. The next prime is 2185193. The reversal of 2185191 is 1915812.

It is an interprime number because it is at equal distance from previous prime (2185189) and next prime (2185193).

It is not a de Polignac number, because 2185191 - 2¹ = 2185189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 80933 = 2185191 / (2 + 1 + 8 + 5 + 1 + 9 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185193) 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 in 7 ways as a sum of consecutive naturals, for example, 40440 + ... + 40493.

It is an arithmetic number, because the mean of its divisors is an integer number (404670).

2^2185191 is an apocalyptic number.

2185191 is a deficient number, since it is larger than the sum of its proper divisors (1052169).

2185191 is an equidigital number, since it uses as much as digits as its factorization.

2185191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80942 (or 80936 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 2185191 is about 1478.2391552114. The cubic root of 2185191 is about 129.7666622993.

It can be divided in two parts, 2 and 185191, that added together give a cube (185193 = 57³).

The spelling of 2185191 in words is "two million, one hundred eighty-five thousand, one hundred ninety-one".