84985561 has 2 divisors, whose sum is σ = 84985562. Its totient is φ = 84985560.

The previous prime is 84985543. The next prime is 84985583. The reversal of 84985561 is 16558948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64000000 + 20985561 = 8000^2 + 4581^2 .

It is a cyclic number.

It is not a de Polignac number, because 84985561 - 2⁹ = 84985049 is a prime.

It is not a weakly prime, because it can be changed into another prime (84985591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42492780 + 42492781.

It is an arithmetic number, because the mean of its divisors is an integer number (42492781).

Almost surely, 2^84985561 is an apocalyptic number.

It is an amenable number.

84985561 is a deficient number, since it is larger than the sum of its proper divisors (1).

84985561 is an equidigital number, since it uses as much as digits as its factorization.

84985561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 46.

The square root of 84985561 is about 9218.7613593150. The cubic root of 84985561 is about 439.6580694045.

The spelling of 84985561 in words is "eighty-four million, nine hundred eighty-five thousand, five hundred sixty-one".