85581559 has 4 divisors (see below), whose sum is σ = 97807504. Its totient is φ = 73355616.

The previous prime is 85581557. The next prime is 85581563. The reversal of 85581559 is 95518558.

It is a happy number.

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 85581559 - 2¹ = 85581557 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 (85581557) 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, 6112962 + ... + 6112975.

It is an arithmetic number, because the mean of its divisors is an integer number (24451876).

Almost surely, 2^85581559 is an apocalyptic number.

85581559 is a deficient number, since it is larger than the sum of its proper divisors (12225945).

85581559 is a wasteful number, since it uses less digits than its factorization.

85581559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12225944.

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

The square root of 85581559 is about 9251.0301588526. The cubic root of 85581559 is about 440.6834402912.

The spelling of 85581559 in words is "eighty-five million, five hundred eighty-one thousand, five hundred fifty-nine".