84871001 has 2 divisors, whose sum is σ = 84871002. Its totient is φ = 84871000.

The previous prime is 84870991. The next prime is 84871019. The reversal of 84871001 is 10017848.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73547776 + 11323225 = 8576^2 + 3365^2 .

It is a cyclic number.

It is not a de Polignac number, because 84871001 - 2²⁶ = 17762137 is a prime.

It is not a weakly prime, because it can be changed into another prime (84871901) 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, 42435500 + 42435501.

It is an arithmetic number, because the mean of its divisors is an integer number (42435501).

Almost surely, 2^84871001 is an apocalyptic number.

It is an amenable number.

84871001 is a deficient number, since it is larger than the sum of its proper divisors (1).

84871001 is an equidigital number, since it uses as much as digits as its factorization.

84871001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 84871001 is about 9212.5458479185. The cubic root of 84871001 is about 439.4604284705.

Adding to 84871001 its reverse (10017848), we get a palindrome (94888849).

The spelling of 84871001 in words is "eighty-four million, eight hundred seventy-one thousand, one".