705531 has 4 divisors (see below), whose sum is σ = 940712. Its totient is φ = 470352.

The previous prime is 705521. The next prime is 705533. The reversal of 705531 is 135507.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 705531 - 2⁵ = 705499 is a prime.

It is a super-2 number, since 2×705531² = 995547983922, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 705498 and 705507.

It is not an unprimeable number, because it can be changed into a prime (705533) 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 3 ways as a sum of consecutive naturals, for example, 117586 + ... + 117591.

It is an arithmetic number, because the mean of its divisors is an integer number (235178).

2⁷⁰⁵⁵³¹ is an apocalyptic number.

705531 is a deficient number, since it is larger than the sum of its proper divisors (235181).

705531 is a wasteful number, since it uses less digits than its factorization.

705531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235180.

The product of its (nonzero) digits is 525, while the sum is 21.

The square root of 705531 is about 839.9589275673. The cubic root of 705531 is about 89.0236439307.

The spelling of 705531 in words is "seven hundred five thousand, five hundred thirty-one".