85145789 has 2 divisors, whose sum is σ = 85145790. Its totient is φ = 85145788.

The previous prime is 85145779. The next prime is 85145803. The reversal of 85145789 is 98754158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73188025 + 11957764 = 8555^2 + 3458^2 .

It is a cyclic number.

It is not a de Polignac number, because 85145789 - 2⁴ = 85145773 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85145779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42572894 + 42572895.

It is an arithmetic number, because the mean of its divisors is an integer number (42572895).

Almost surely, 2^85145789 is an apocalyptic number.

It is an amenable number.

85145789 is a deficient number, since it is larger than the sum of its proper divisors (1).

85145789 is an equidigital number, since it uses as much as digits as its factorization.

85145789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 47.

The square root of 85145789 is about 9227.4475885805. The cubic root of 85145789 is about 439.9341998711.

The spelling of 85145789 in words is "eighty-five million, one hundred forty-five thousand, seven hundred eighty-nine".