2861191 has 4 divisors (see below), whose sum is σ = 3011800. Its totient is φ = 2710584.

The previous prime is 2861189. The next prime is 2861197. The reversal of 2861191 is 1911682.

It is a happy number.

2861191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1911682 = 2 ⋅955841.

It is a cyclic number.

It is not a de Polignac number, because 2861191 - 2¹ = 2861189 is a prime.

It is a Duffinian number.

2861191 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2861197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75276 + ... + 75313.

It is an arithmetic number, because the mean of its divisors is an integer number (752950).

2^2861191 is an apocalyptic number.

2861191 is a deficient number, since it is larger than the sum of its proper divisors (150609).

2861191 is a wasteful number, since it uses less digits than its factorization.

2861191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150608.

The product of its digits is 864, while the sum is 28.

The square root of 2861191 is about 1691.5055424089. The cubic root of 2861191 is about 141.9653257929.

The spelling of 2861191 in words is "two million, eight hundred sixty-one thousand, one hundred ninety-one".