8441551421 has 2 divisors, whose sum is σ = 8441551422. Its totient is φ = 8441551420.

The previous prime is 8441551361. The next prime is 8441551451. The reversal of 8441551421 is 1241551448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7549872100 + 891679321 = 86890^2 + 29861^2 .

It is a cyclic number.

It is not a de Polignac number, because 8441551421 - 2⁶ = 8441551357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8441551451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4220775710 + 4220775711.

It is an arithmetic number, because the mean of its divisors is an integer number (4220775711).

Almost surely, 2^8441551421 is an apocalyptic number.

It is an amenable number.

8441551421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8441551421 is an equidigital number, since it uses as much as digits as its factorization.

8441551421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25600, while the sum is 35.

The square root of 8441551421 is about 91877.9158503283. The cubic root of 8441551421 is about 2036.1390047077.

The spelling of 8441551421 in words is "eight billion, four hundred forty-one million, five hundred fifty-one thousand, four hundred twenty-one".