8649672289 has 2 divisors, whose sum is σ = 8649672290. Its totient is φ = 8649672288.

The previous prime is 8649672217. The next prime is 8649672293. The reversal of 8649672289 is 9822769468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5643014400 + 3006657889 = 75120^2 + 54833^2 .

It is a cyclic number.

It is not a de Polignac number, because 8649672289 - 2¹¹ = 8649670241 is a prime.

It is a super-3 number, since 3×8649672289³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (8649672389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4324836144 + 4324836145.

It is an arithmetic number, because the mean of its divisors is an integer number (4324836145).

Almost surely, 2^8649672289 is an apocalyptic number.

It is an amenable number.

8649672289 is a deficient number, since it is larger than the sum of its proper divisors (1).

8649672289 is an equidigital number, since it uses as much as digits as its factorization.

8649672289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20901888, while the sum is 61.

The square root of 8649672289 is about 93003.6143867538. The cubic root of 8649672289 is about 2052.7365625653.

The spelling of 8649672289 in words is "eight billion, six hundred forty-nine million, six hundred seventy-two thousand, two hundred eighty-nine".