85445561 has 4 divisors (see below), whose sum is σ = 85778292. Its totient is φ = 85112832.

The previous prime is 85445533. The next prime is 85445609. The reversal of 85445561 is 16554458.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16554458 = 2 ⋅8277229.

It can be written as a sum of positive squares in 2 ways, for example, as 46308025 + 39137536 = 6805^2 + 6256^2 .

It is a cyclic number.

It is not a de Polignac number, because 85445561 - 2¹⁰ = 85444537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85445461) 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, 165980 + ... + 166493.

It is an arithmetic number, because the mean of its divisors is an integer number (21444573).

Almost surely, 2^85445561 is an apocalyptic number.

It is an amenable number.

85445561 is a deficient number, since it is larger than the sum of its proper divisors (332731).

85445561 is a wasteful number, since it uses less digits than its factorization.

85445561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332730.

The product of its digits is 96000, while the sum is 38.

The square root of 85445561 is about 9243.6768117454. The cubic root of 85445561 is about 440.4498859236.

The spelling of 85445561 in words is "eighty-five million, four hundred forty-five thousand, five hundred sixty-one".