82170889 has 2 divisors, whose sum is σ = 82170890. Its totient is φ = 82170888.

The previous prime is 82170883. The next prime is 82170901. The reversal of 82170889 is 98807128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60964864 + 21206025 = 7808^2 + 4605^2 .

It is a cyclic number.

It is not a de Polignac number, because 82170889 - 2⁷ = 82170761 is a prime.

It is not a weakly prime, because it can be changed into another prime (82170883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41085444 + 41085445.

It is an arithmetic number, because the mean of its divisors is an integer number (41085445).

Almost surely, 2^82170889 is an apocalyptic number.

It is an amenable number.

82170889 is a deficient number, since it is larger than the sum of its proper divisors (1).

82170889 is an equidigital number, since it uses as much as digits as its factorization.

82170889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 82170889 is about 9064.8159937199. The cubic root of 82170889 is about 434.7497375820.

The spelling of 82170889 in words is "eighty-two million, one hundred seventy thousand, eight hundred eighty-nine".