89972171 has 2 divisors, whose sum is σ = 89972172. Its totient is φ = 89972170.

The previous prime is 89972149. The next prime is 89972173. The reversal of 89972171 is 17127998.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 89972171 - 2⁶ = 89972107 is a prime.

Together with 89972173, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (89972173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44986085 + 44986086.

It is an arithmetic number, because the mean of its divisors is an integer number (44986086).

Almost surely, 2^89972171 is an apocalyptic number.

89972171 is a deficient number, since it is larger than the sum of its proper divisors (1).

89972171 is an equidigital number, since it uses as much as digits as its factorization.

89972171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 44.

The square root of 89972171 is about 9485.3661500229. The cubic root of 89972171 is about 448.0942798894.

The spelling of 89972171 in words is "eighty-nine million, nine hundred seventy-two thousand, one hundred seventy-one".