85750009 has 2 divisors, whose sum is σ = 85750010. Its totient is φ = 85750008.

The previous prime is 85749959. The next prime is 85750051. The reversal of 85750009 is 90005758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69973225 + 15776784 = 8365^2 + 3972^2 .

It is a cyclic number.

It is not a de Polignac number, because 85750009 - 2¹⁷ = 85618937 is a prime.

It is not a weakly prime, because it can be changed into another prime (85750099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42875004 + 42875005.

It is an arithmetic number, because the mean of its divisors is an integer number (42875005).

Almost surely, 2^85750009 is an apocalyptic number.

It is an amenable number.

85750009 is a deficient number, since it is larger than the sum of its proper divisors (1).

85750009 is an equidigital number, since it uses as much as digits as its factorization.

85750009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 85750009 is about 9260.1300746804. The cubic root of 85750009 is about 440.9723828908.

The spelling of 85750009 in words is "eighty-five million, seven hundred fifty thousand, nine".