705740081 has 4 divisors (see below), whose sum is σ = 706073700. Its totient is φ = 705406464.

The previous prime is 705740059. The next prime is 705740107. The reversal of 705740081 is 180047507.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180047507 = 277 ⋅649991.

It can be written as a sum of positive squares in 2 ways, for example, as 415344400 + 290395681 = 20380^2 + 17041^2 .

It is a cyclic number.

It is not a de Polignac number, because 705740081 - 2¹⁰ = 705739057 is a prime.

It is a super-2 number, since 2×705740081² = 996138123859773122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (705745081) 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, 163616 + ... + 167873.

It is an arithmetic number, because the mean of its divisors is an integer number (176518425).

Almost surely, 2^705740081 is an apocalyptic number.

It is an amenable number.

705740081 is a deficient number, since it is larger than the sum of its proper divisors (333619).

705740081 is a wasteful number, since it uses less digits than its factorization.

705740081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333618.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 705740081 is about 26565.7689706133. The cubic root of 705740081 is about 890.3243698353.

Adding to 705740081 its reverse (180047507), we get a palindrome (885787588).

The spelling of 705740081 in words is "seven hundred five million, seven hundred forty thousand, eighty-one".