705581 has 4 divisors (see below), whose sum is σ = 717600. Its totient is φ = 693564.

The previous prime is 705559. The next prime is 705613. The reversal of 705581 is 185507.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 185507 = 7 ⋅26501.

It is a cyclic number.

It is not a de Polignac number, because 705581 - 2¹⁸ = 443437 is a prime.

It is a super-2 number, since 2×705581² = 995689095122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 705581.

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 705581.

It is not an unprimeable number, because it can be changed into a prime (705521) 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, 5921 + ... + 6038.

It is an arithmetic number, because the mean of its divisors is an integer number (179400).

2⁷⁰⁵⁵⁸¹ is an apocalyptic number.

It is an amenable number.

705581 is a deficient number, since it is larger than the sum of its proper divisors (12019).

705581 is a wasteful number, since it uses less digits than its factorization.

705581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12018.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 705581 is about 839.9886904001. The cubic root of 705581 is about 89.0257468749.

The spelling of 705581 in words is "seven hundred five thousand, five hundred eighty-one".