4381821197 has 4 divisors (see below), whose sum is σ = 4718884380. Its totient is φ = 4044758016.

The previous prime is 4381821193. The next prime is 4381821221. The reversal of 4381821197 is 7911281834.

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 668015716 + 3713805481 = 25846^2 + 60941^2 .

It is not a de Polignac number, because 4381821197 - 2² = 4381821193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4381821193) 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 3 ways as a sum of consecutive naturals, for example, 168531572 + ... + 168531597.

It is an arithmetic number, because the mean of its divisors is an integer number (1179721095).

Almost surely, 2^4381821197 is an apocalyptic number.

It is an amenable number.

4381821197 is a deficient number, since it is larger than the sum of its proper divisors (337063183).

4381821197 is a wasteful number, since it uses less digits than its factorization.

4381821197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337063182.

The product of its digits is 96768, while the sum is 44.

The square root of 4381821197 is about 66195.3260963340. The cubic root of 4381821197 is about 1636.3827170621.

The spelling of 4381821197 in words is "four billion, three hundred eighty-one million, eight hundred twenty-one thousand, one hundred ninety-seven".