4161189821 has 2 divisors, whose sum is σ = 4161189822. Its totient is φ = 4161189820.

The previous prime is 4161189779. The next prime is 4161189839. The reversal of 4161189821 is 1289811614.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2421132025 + 1740057796 = 49205^2 + 41714^2 .

It is a cyclic number.

It is not a de Polignac number, because 4161189821 - 2⁶ = 4161189757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4161189871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2080594910 + 2080594911.

It is an arithmetic number, because the mean of its divisors is an integer number (2080594911).

Almost surely, 2^4161189821 is an apocalyptic number.

It is an amenable number.

4161189821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4161189821 is an equidigital number, since it uses as much as digits as its factorization.

4161189821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 41.

The square root of 4161189821 is about 64507.2850227011. The cubic root of 4161189821 is about 1608.4436203562.

The spelling of 4161189821 in words is "four billion, one hundred sixty-one million, one hundred eighty-nine thousand, eight hundred twenty-one".