84220001 has 2 divisors, whose sum is σ = 84220002. Its totient is φ = 84220000.

The previous prime is 84219991. The next prime is 84220009. The reversal of 84220001 is 10002248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84198976 + 21025 = 9176^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 84220001 - 2¹⁸ = 83957857 is a prime.

It is not a weakly prime, because it can be changed into another prime (84220009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42110000 + 42110001.

It is an arithmetic number, because the mean of its divisors is an integer number (42110001).

Almost surely, 2^84220001 is an apocalyptic number.

It is an amenable number.

84220001 is a deficient number, since it is larger than the sum of its proper divisors (1).

84220001 is an equidigital number, since it uses as much as digits as its factorization.

84220001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 84220001 is about 9177.1455801900. The cubic root of 84220001 is about 438.3339213930. Note that the first 3 decimals are identical.

Adding to 84220001 its reverse (10002248), we get a palindrome (94222249).

The spelling of 84220001 in words is "eighty-four million, two hundred twenty thousand, one".