85958309 has 4 divisors (see below), whose sum is σ = 86719116. Its totient is φ = 85197504.

The previous prime is 85958293. The next prime is 85958311. The reversal of 85958309 is 90385958.

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 32741284 + 53217025 = 5722^2 + 7295^2 .

It is a cyclic number.

It is not a de Polignac number, because 85958309 - 2⁴ = 85958293 is a prime.

It is a super-2 number, since 2×85958309² = 14777661772278962, 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 (85958329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380234 + ... + 380459.

It is an arithmetic number, because the mean of its divisors is an integer number (21679779).

Almost surely, 2^85958309 is an apocalyptic number.

It is an amenable number.

85958309 is a deficient number, since it is larger than the sum of its proper divisors (760807).

85958309 is a wasteful number, since it uses less digits than its factorization.

85958309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760806.

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 85958309 is about 9271.3703949308. The cubic root of 85958309 is about 441.3291574745.

The spelling of 85958309 in words is "eighty-five million, nine hundred fifty-eight thousand, three hundred nine".