4471981 has 4 divisors (see below), whose sum is σ = 4556412. Its totient is φ = 4387552.

The previous prime is 4471979. The next prime is 4471997. The reversal of 4471981 is 1891744.

4471981 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3481956 + 990025 = 1866^2 + 995^2 .

It is not a de Polignac number, because 4471981 - 2¹ = 4471979 is a prime.

It is a super-2 number, since 2×4471981² = 39997228128722, which contains 22 as substring.

It is a Duffinian number.

4471981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4471921) 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, 42136 + ... + 42241.

It is an arithmetic number, because the mean of its divisors is an integer number (1139103).

Almost surely, 2^4471981 is an apocalyptic number.

It is an amenable number.

4471981 is a deficient number, since it is larger than the sum of its proper divisors (84431).

4471981 is an equidigital number, since it uses as much as digits as its factorization.

4471981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84430.

The product of its digits is 8064, while the sum is 34.

The square root of 4471981 is about 2114.7058897161. The cubic root of 4471981 is about 164.7529943586.

The spelling of 4471981 in words is "four million, four hundred seventy-one thousand, nine hundred eighty-one".