355581 has 6 divisors (see below), whose sum is σ = 513630. Its totient is φ = 237048.

The previous prime is 355573. The next prime is 355591. The reversal of 355581 is 185553.

It can be written as a sum of positive squares in only one way, i.e., 260100 + 95481 = 510^2 + 309^2 .

It is not a de Polignac number, because 355581 - 2³ = 355573 is a prime.

It is a super-2 number, since 2×355581² = 252875695122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 355581.

It is not an unprimeable number, because it can be changed into a prime (355501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19746 + ... + 19763.

It is an arithmetic number, because the mean of its divisors is an integer number (85605).

2³⁵⁵⁵⁸¹ is an apocalyptic number.

It is an amenable number.

355581 is a deficient number, since it is larger than the sum of its proper divisors (158049).

355581 is a wasteful number, since it uses less digits than its factorization.

355581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39515 (or 39512 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 355581 is about 596.3061294335. The cubic root of 355581 is about 70.8455944942.

The spelling of 355581 in words is "three hundred fifty-five thousand, five hundred eighty-one".