85723289 has 2 divisors, whose sum is σ = 85723290. Its totient is φ = 85723288.

The previous prime is 85723273. The next prime is 85723301. The reversal of 85723289 is 98232758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48720400 + 37002889 = 6980^2 + 6083^2 .

It is a cyclic number.

It is not a de Polignac number, because 85723289 - 2⁴ = 85723273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85723249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42861644 + 42861645.

It is an arithmetic number, because the mean of its divisors is an integer number (42861645).

Almost surely, 2^85723289 is an apocalyptic number.

It is an amenable number.

85723289 is a deficient number, since it is larger than the sum of its proper divisors (1).

85723289 is an equidigital number, since it uses as much as digits as its factorization.

85723289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 85723289 is about 9258.6872179591. The cubic root of 85723289 is about 440.9265752916.

The spelling of 85723289 in words is "eighty-five million, seven hundred twenty-three thousand, two hundred eighty-nine".