84676561 has 2 divisors, whose sum is σ = 84676562. Its totient is φ = 84676560.

The previous prime is 84676523. The next prime is 84676573. The reversal of 84676561 is 16567648.

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., 81721600 + 2954961 = 9040^2 + 1719^2 .

It is a cyclic number.

It is not a de Polignac number, because 84676561 - 2⁹ = 84676049 is a prime.

It is not a weakly prime, because it can be changed into another prime (84676261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42338280 + 42338281.

It is an arithmetic number, because the mean of its divisors is an integer number (42338281).

Almost surely, 2^84676561 is an apocalyptic number.

It is an amenable number.

84676561 is a deficient number, since it is larger than the sum of its proper divisors (1).

84676561 is an equidigital number, since it uses as much as digits as its factorization.

84676561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 84676561 is about 9201.9867963391. The cubic root of 84676561 is about 439.1245696480.

The spelling of 84676561 in words is "eighty-four million, six hundred seventy-six thousand, five hundred sixty-one".