2191471 has 2 divisors, whose sum is σ = 2191472. Its totient is φ = 2191470.

The previous prime is 2191459. The next prime is 2191477. The reversal of 2191471 is 1741912.

2191471 is nontrivially palindromic in base 6.

2191471 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2191471 - 2⁹ = 2190959 is a prime.

It is a super-3 number, since 3×2191471³ = 31573915226755140333, which contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2191477) 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 as a sum of consecutive naturals, namely, 1095735 + 1095736.

It is an arithmetic number, because the mean of its divisors is an integer number (1095736).

2^2191471 is an apocalyptic number.

2191471 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191471 is an equidigital number, since it uses as much as digits as its factorization.

2191471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 25.

The square root of 2191471 is about 1480.3617801065. The cubic root of 2191471 is about 129.8908551358.

It can be divided in two parts, 2191 and 471, that added together give a palindrome (2662).

The spelling of 2191471 in words is "two million, one hundred ninety-one thousand, four hundred seventy-one".