84844561 has 2 divisors, whose sum is σ = 84844562. Its totient is φ = 84844560.

The previous prime is 84844559. The next prime is 84844583. The reversal of 84844561 is 16544848.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83905600 + 938961 = 9160^2 + 969^2 .

It is a cyclic number.

It is not a de Polignac number, because 84844561 - 2¹ = 84844559 is a prime.

Together with 84844559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (84844261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42422280 + 42422281.

It is an arithmetic number, because the mean of its divisors is an integer number (42422281).

Almost surely, 2^84844561 is an apocalyptic number.

It is an amenable number.

84844561 is a deficient number, since it is larger than the sum of its proper divisors (1).

84844561 is an equidigital number, since it uses as much as digits as its factorization.

84844561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122880, while the sum is 40.

The square root of 84844561 is about 9211.1107364964. The cubic root of 84844561 is about 439.4147884584.

The spelling of 84844561 in words is "eighty-four million, eight hundred forty-four thousand, five hundred sixty-one".