85649561 has 8 divisors (see below), whose sum is σ = 88238280. Its totient is φ = 83075328.

The previous prime is 85649479. The next prime is 85649567. The reversal of 85649561 is 16594658.

It can be written as a sum of positive squares in 4 ways, for example, as 2383936 + 83265625 = 1544^2 + 9125^2 .

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 85649561 - 2¹⁸ = 85387417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85649567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9035 + ... + 15903.

It is an arithmetic number, because the mean of its divisors is an integer number (11029785).

Almost surely, 2^85649561 is an apocalyptic number.

It is an amenable number.

85649561 is a deficient number, since it is larger than the sum of its proper divisors (2588719).

85649561 is a wasteful number, since it uses less digits than its factorization.

85649561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7243.

The product of its digits is 259200, while the sum is 44.

The square root of 85649561 is about 9254.7048035040. The cubic root of 85649561 is about 440.8001298442.

The spelling of 85649561 in words is "eighty-five million, six hundred forty-nine thousand, five hundred sixty-one".