85087309 has 4 divisors (see below), whose sum is σ = 87387004. Its totient is φ = 82787616.

The previous prime is 85087307. The next prime is 85087319. The reversal of 85087309 is 90378058.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77264100 + 7823209 = 8790^2 + 2797^2 .

It is a cyclic number.

It is not a de Polignac number, because 85087309 - 2¹ = 85087307 is a prime.

It is a super-2 number, since 2×85087309² = 14479700305722962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85087307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1149792 + ... + 1149865.

It is an arithmetic number, because the mean of its divisors is an integer number (21846751).

Almost surely, 2^85087309 is an apocalyptic number.

It is an amenable number.

85087309 is a deficient number, since it is larger than the sum of its proper divisors (2299695).

85087309 is a wasteful number, since it uses less digits than its factorization.

85087309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2299694.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 85087309 is about 9224.2782373474. The cubic root of 85087309 is about 439.8334579765.

The spelling of 85087309 in words is "eighty-five million, eighty-seven thousand, three hundred nine".