1085585581 has 2 divisors, whose sum is σ = 1085585582. Its totient is φ = 1085585580.

The previous prime is 1085585573. The next prime is 1085585593. The reversal of 1085585581 is 1855855801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1085109481 + 476100 = 32941^2 + 690^2 .

It is an emirp because it is prime and its reverse (1855855801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1085585581 - 2³ = 1085585573 is a prime.

It is a super-2 number, since 2×1085585581² = 2356992107350215122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1085585521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542792790 + 542792791.

It is an arithmetic number, because the mean of its divisors is an integer number (542792791).

Almost surely, 2^1085585581 is an apocalyptic number.

It is an amenable number.

1085585581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085585581 is an equidigital number, since it uses as much as digits as its factorization.

1085585581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320000, while the sum is 46.

The square root of 1085585581 is about 32948.2257640681. The cubic root of 1085585581 is about 1027.7512699595.

The spelling of 1085585581 in words is "one billion, eighty-five million, five hundred eighty-five thousand, five hundred eighty-one".