85733209 has 2 divisors, whose sum is σ = 85733210. Its totient is φ = 85733208.

The previous prime is 85733203. The next prime is 85733231. The reversal of 85733209 is 90233758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54686025 + 31047184 = 7395^2 + 5572^2 .

It is a cyclic number.

It is not a de Polignac number, because 85733209 - 2³ = 85733201 is a prime.

It is not a weakly prime, because it can be changed into another prime (85733201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42866604 + 42866605.

It is an arithmetic number, because the mean of its divisors is an integer number (42866605).

Almost surely, 2^85733209 is an apocalyptic number.

It is an amenable number.

85733209 is a deficient number, since it is larger than the sum of its proper divisors (1).

85733209 is an equidigital number, since it uses as much as digits as its factorization.

85733209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 85733209 is about 9259.2229155583. Note that the first 3 decimals coincide. The cubic root of 85733209 is about 440.9435828165.

The spelling of 85733209 in words is "eighty-five million, seven hundred thirty-three thousand, two hundred nine".