85685515 has 4 divisors (see below), whose sum is σ = 102822624. Its totient is φ = 68548408.

The previous prime is 85685513. The next prime is 85685521. The reversal of 85685515 is 51558658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51558658 = 2 ⋅25779329.

It is a cyclic number.

It is not a de Polignac number, because 85685515 - 2¹ = 85685513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85685513) 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, 8568547 + ... + 8568556.

It is an arithmetic number, because the mean of its divisors is an integer number (25705656).

Almost surely, 2^85685515 is an apocalyptic number.

85685515 is a deficient number, since it is larger than the sum of its proper divisors (17137109).

85685515 is a wasteful number, since it uses less digits than its factorization.

85685515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17137108.

The product of its digits is 240000, while the sum is 43.

The square root of 85685515 is about 9256.6470711592. The cubic root of 85685515 is about 440.8618009552.

The spelling of 85685515 in words is "eighty-five million, six hundred eighty-five thousand, five hundred fifteen".