85210709 has 2 divisors, whose sum is σ = 85210710. Its totient is φ = 85210708.

The previous prime is 85210703. The next prime is 85210711. The reversal of 85210709 is 90701258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64480900 + 20729809 = 8030^2 + 4553^2 .

It is a cyclic number.

It is not a de Polignac number, because 85210709 - 2⁴ = 85210693 is a prime.

Together with 85210711, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85210703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42605354 + 42605355.

It is an arithmetic number, because the mean of its divisors is an integer number (42605355).

Almost surely, 2^85210709 is an apocalyptic number.

It is an amenable number.

85210709 is a deficient number, since it is larger than the sum of its proper divisors (1).

85210709 is an equidigital number, since it uses as much as digits as its factorization.

85210709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 85210709 is about 9230.9646841487. The cubic root of 85210709 is about 440.0459817648.

The spelling of 85210709 in words is "eighty-five million, two hundred ten thousand, seven hundred nine".