85011561 has 6 divisors (see below), whose sum is σ = 122794490. Its totient is φ = 56674368.

The previous prime is 85011551. The next prime is 85011569. The reversal of 85011561 is 16511058.

85011561 is a `hidden beast` number, since 8 + 501 + 156 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 74649600 + 10361961 = 8640^2 + 3219^2 .

It is not a de Polignac number, because 85011561 - 2⁶ = 85011497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85011569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4722856 + ... + 4722873.

Almost surely, 2^85011561 is an apocalyptic number.

It is an amenable number.

85011561 is a deficient number, since it is larger than the sum of its proper divisors (37782929).

85011561 is a wasteful number, since it uses less digits than its factorization.

85011561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9445735 (or 9445732 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 85011561 is about 9220.1714192308. The cubic root of 85011561 is about 439.7029003309.

The spelling of 85011561 in words is "eighty-five million, eleven thousand, five hundred sixty-one".