85581563 has 2 divisors, whose sum is σ = 85581564. Its totient is φ = 85581562.

The previous prime is 85581557. The next prime is 85581589. The reversal of 85581563 is 36518558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85581563 - 2⁴ = 85581547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85581563.

It is not a weakly prime, because it can be changed into another prime (85581533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42790781 + 42790782.

It is an arithmetic number, because the mean of its divisors is an integer number (42790782).

Almost surely, 2^85581563 is an apocalyptic number.

85581563 is a deficient number, since it is larger than the sum of its proper divisors (1).

85581563 is an equidigital number, since it uses as much as digits as its factorization.

85581563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144000, while the sum is 41.

The square root of 85581563 is about 9251.0303750447. The cubic root of 85581563 is about 440.6834471569.

The spelling of 85581563 in words is "eighty-five million, five hundred eighty-one thousand, five hundred sixty-three".