84456641 has 2 divisors, whose sum is σ = 84456642. Its totient is φ = 84456640.

The previous prime is 84456637. The next prime is 84456643. The reversal of 84456641 is 14665448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84364225 + 92416 = 9185^2 + 304^2 .

It is a cyclic number.

It is not a de Polignac number, because 84456641 - 2² = 84456637 is a prime.

Together with 84456643, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 84456595 and 84456604.

It is not a weakly prime, because it can be changed into another prime (84456643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42228320 + 42228321.

It is an arithmetic number, because the mean of its divisors is an integer number (42228321).

Almost surely, 2^84456641 is an apocalyptic number.

It is an amenable number.

84456641 is a deficient number, since it is larger than the sum of its proper divisors (1).

84456641 is an equidigital number, since it uses as much as digits as its factorization.

84456641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 38.

The square root of 84456641 is about 9190.0294341204. The cubic root of 84456641 is about 438.7440786749.

The spelling of 84456641 in words is "eighty-four million, four hundred fifty-six thousand, six hundred forty-one".