85155985 has 8 divisors (see below), whose sum is σ = 102568680. Its totient is φ = 67870464.

The previous prime is 85155979. The next prime is 85155989. The reversal of 85155985 is 58955158.

It is a happy number.

It is a Cunningham number, because it is equal to 9228²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 5607424 + 79548561 = 2368^2 + 8919^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85155985 - 2⁷ = 85155857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85155989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30312 + ... + 33001.

It is an arithmetic number, because the mean of its divisors is an integer number (12821085).

Almost surely, 2^85155985 is an apocalyptic number.

It is an amenable number.

85155985 is a deficient number, since it is larger than the sum of its proper divisors (17412695).

85155985 is a wasteful number, since it uses less digits than its factorization.

85155985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63587.

The product of its digits is 360000, while the sum is 46.

The square root of 85155985 is about 9228.0000541829. Note that the first 4 decimals coincide. The cubic root of 85155985 is about 439.9517595184.

The spelling of 85155985 in words is "eighty-five million, one hundred fifty-five thousand, nine hundred eighty-five".