84945661 has 2 divisors, whose sum is σ = 84945662. Its totient is φ = 84945660.

The previous prime is 84945631. The next prime is 84945667. The reversal of 84945661 is 16654948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84529636 + 416025 = 9194^2 + 645^2 .

It is a cyclic number.

It is not a de Polignac number, because 84945661 - 2⁵ = 84945629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84945667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42472830 + 42472831.

It is an arithmetic number, because the mean of its divisors is an integer number (42472831).

Almost surely, 2^84945661 is an apocalyptic number.

It is an amenable number.

84945661 is a deficient number, since it is larger than the sum of its proper divisors (1).

84945661 is an equidigital number, since it uses as much as digits as its factorization.

84945661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The square root of 84945661 is about 9216.5970401228. The cubic root of 84945661 is about 439.5892533892.

The spelling of 84945661 in words is "eighty-four million, nine hundred forty-five thousand, six hundred sixty-one".