705812881 has 4 divisors (see below), whose sum is σ = 707627700. Its totient is φ = 703998064.

The previous prime is 705812857. The next prime is 705812971. The reversal of 705812881 is 188218507.

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

It can be written as a sum of positive squares in 2 ways, for example, as 209236225 + 496576656 = 14465^2 + 22284^2 .

It is a cyclic number.

It is not a de Polignac number, because 705812881 - 2¹⁹ = 705288593 is a prime.

It is a super-2 number, since 2×705812881² = 996343645971040322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (705812281) 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, 906826 + ... + 907603.

It is an arithmetic number, because the mean of its divisors is an integer number (176906925).

Almost surely, 2^705812881 is an apocalyptic number.

It is an amenable number.

705812881 is a deficient number, since it is larger than the sum of its proper divisors (1814819).

705812881 is a wasteful number, since it uses less digits than its factorization.

705812881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814818.

The product of its (nonzero) digits is 35840, while the sum is 40.

The square root of 705812881 is about 26567.1391195966. The cubic root of 705812881 is about 890.3549823263.

It can be divided in two parts, 70581 and 2881, that multiplied together give a triangular number (203343861 = T₂₀₁₆₆).

The spelling of 705812881 in words is "seven hundred five million, eight hundred twelve thousand, eight hundred eighty-one".