84448424581 has 2 divisors, whose sum is σ = 84448424582. Its totient is φ = 84448424580.

The previous prime is 84448424573. The next prime is 84448424609. The reversal of 84448424581 is 18542484448.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65346696900 + 19101727681 = 255630^2 + 138209^2 .

It is a cyclic number.

It is not a de Polignac number, because 84448424581 - 2³ = 84448424573 is a prime.

It is a super-2 number, since 2×84448424581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84448424381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42224212290 + 42224212291.

It is an arithmetic number, because the mean of its divisors is an integer number (42224212291).

Almost surely, 2^84448424581 is an apocalyptic number.

It is an amenable number.

84448424581 is a deficient number, since it is larger than the sum of its proper divisors (1).

84448424581 is an equidigital number, since it uses as much as digits as its factorization.

84448424581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5242880, while the sum is 52.

The spelling of 84448424581 in words is "eighty-four billion, four hundred forty-eight million, four hundred twenty-four thousand, five hundred eighty-one".