85161215 has 4 divisors (see below), whose sum is σ = 102193464. Its totient is φ = 68128968.

The previous prime is 85161187. The next prime is 85161217. The reversal of 85161215 is 51216158.

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

It is a cyclic number.

It is not a de Polignac number, because 85161215 - 2⁶ = 85161151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85161217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8516117 + ... + 8516126.

It is an arithmetic number, because the mean of its divisors is an integer number (25548366).

Almost surely, 2^85161215 is an apocalyptic number.

85161215 is a deficient number, since it is larger than the sum of its proper divisors (17032249).

85161215 is a wasteful number, since it uses less digits than its factorization.

85161215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17032248.

The product of its digits is 2400, while the sum is 29.

The square root of 85161215 is about 9228.2834265100. The cubic root of 85161215 is about 439.9607661298.

The spelling of 85161215 in words is "eighty-five million, one hundred sixty-one thousand, two hundred fifteen".