705053821 has 4 divisors (see below), whose sum is σ = 705325852. Its totient is φ = 704781792.

The previous prime is 705053813. The next prime is 705053827. The reversal of 705053821 is 128350507.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128350507 = 431 ⋅297797.

It can be written as a sum of positive squares in 2 ways, for example, as 690953796 + 14100025 = 26286^2 + 3755^2 .

It is a cyclic number.

It is not a de Polignac number, because 705053821 - 2³ = 705053813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705053827) 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, 132090 + ... + 137323.

It is an arithmetic number, because the mean of its divisors is an integer number (176331463).

Almost surely, 2^705053821 is an apocalyptic number.

It is an amenable number.

705053821 is a deficient number, since it is larger than the sum of its proper divisors (272031).

705053821 is a wasteful number, since it uses less digits than its factorization.

705053821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272030.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 705053821 is about 26552.8495834251. The cubic root of 705053821 is about 890.0356931357.

The spelling of 705053821 in words is "seven hundred five million, fifty-three thousand, eight hundred twenty-one".