84518969 has 2 divisors, whose sum is σ = 84518970. Its totient is φ = 84518968.

The previous prime is 84518957. The next prime is 84518971. The reversal of 84518969 is 96981548.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46240000 + 38278969 = 6800^2 + 6187^2 .

It is a cyclic number.

It is not a de Polignac number, because 84518969 - 2⁴ = 84518953 is a prime.

It is a super-2 number, since 2×84518969² = 14286912241645922, which contains 22 as substring.

Together with 84518971, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84517969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42259484 + 42259485.

It is an arithmetic number, because the mean of its divisors is an integer number (42259485).

Almost surely, 2^84518969 is an apocalyptic number.

It is an amenable number.

84518969 is a deficient number, since it is larger than the sum of its proper divisors (1).

84518969 is an equidigital number, since it uses as much as digits as its factorization.

84518969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 50.

The square root of 84518969 is about 9193.4198751063. The cubic root of 84518969 is about 438.8519814454.

The spelling of 84518969 in words is "eighty-four million, five hundred eighteen thousand, nine hundred sixty-nine".