85245709 has 2 divisors, whose sum is σ = 85245710. Its totient is φ = 85245708.

The previous prime is 85245697. The next prime is 85245749. The reversal of 85245709 is 90754258.

It is an a-pointer prime, because the next prime (85245749) can be obtained adding 85245709 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84235684 + 1010025 = 9178^2 + 1005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85245709 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85245749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42622854 + 42622855.

It is an arithmetic number, because the mean of its divisors is an integer number (42622855).

Almost surely, 2^85245709 is an apocalyptic number.

It is an amenable number.

85245709 is a deficient number, since it is larger than the sum of its proper divisors (1).

85245709 is an equidigital number, since it uses as much as digits as its factorization.

85245709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 85245709 is about 9232.8602827076. The cubic root of 85245709 is about 440.1062226324.

The spelling of 85245709 in words is "eighty-five million, two hundred forty-five thousand, seven hundred nine".