8971449581 has 2 divisors, whose sum is σ = 8971449582. Its totient is φ = 8971449580.

The previous prime is 8971449551. The next prime is 8971449589. The reversal of 8971449581 is 1859441798.

8971449581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7714108900 + 1257340681 = 87830^2 + 35459^2 .

It is a cyclic number.

It is not a de Polignac number, because 8971449581 - 2⁶ = 8971449517 is a prime.

It is a super-2 number, since 2×8971449581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8971449589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4485724790 + 4485724791.

It is an arithmetic number, because the mean of its divisors is an integer number (4485724791).

Almost surely, 2^8971449581 is an apocalyptic number.

It is an amenable number.

8971449581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8971449581 is an equidigital number, since it uses as much as digits as its factorization.

8971449581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 56.

The square root of 8971449581 is about 94717.7363591424. The cubic root of 8971449581 is about 2077.8819647902.

The spelling of 8971449581 in words is "eight billion, nine hundred seventy-one million, four hundred forty-nine thousand, five hundred eighty-one".