84654221 has 2 divisors, whose sum is σ = 84654222. Its totient is φ = 84654220.

The previous prime is 84654151. The next prime is 84654233. The reversal of 84654221 is 12245648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83356900 + 1297321 = 9130^2 + 1139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84654221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84654281) 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, 42327110 + 42327111.

It is an arithmetic number, because the mean of its divisors is an integer number (42327111).

Almost surely, 2^84654221 is an apocalyptic number.

It is an amenable number.

84654221 is a deficient number, since it is larger than the sum of its proper divisors (1).

84654221 is an equidigital number, since it uses as much as digits as its factorization.

84654221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15360, while the sum is 32.

The square root of 84654221 is about 9200.7728479732. The cubic root of 84654221 is about 439.0859485482.

Adding to 84654221 its reverse (12245648), we get a palindrome (96899869).

The spelling of 84654221 in words is "eighty-four million, six hundred fifty-four thousand, two hundred twenty-one".