84945569 has 2 divisors, whose sum is σ = 84945570. Its totient is φ = 84945568.

The previous prime is 84945559. The next prime is 84945571. The reversal of 84945569 is 96554948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65691025 + 19254544 = 8105^2 + 4388^2 .

It is a cyclic number.

It is not a de Polignac number, because 84945569 - 2⁸ = 84945313 is a prime.

It is a super-2 number, since 2×84945569² = 14431499385467522, which contains 22 as substring.

Together with 84945571, 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 (84945559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42472784 + 42472785.

It is an arithmetic number, because the mean of its divisors is an integer number (42472785).

Almost surely, 2^84945569 is an apocalyptic number.

It is an amenable number.

84945569 is a deficient number, since it is larger than the sum of its proper divisors (1).

84945569 is an equidigital number, since it uses as much as digits as its factorization.

84945569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1555200, while the sum is 50.

The square root of 84945569 is about 9216.5920491253. The cubic root of 84945569 is about 439.5890946908.

The spelling of 84945569 in words is "eighty-four million, nine hundred forty-five thousand, five hundred sixty-nine".