705155221 has 4 divisors (see below), whose sum is σ = 706791744. Its totient is φ = 703518700.

The previous prime is 705155219. The next prime is 705155239. The reversal of 705155221 is 122551507.

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: 122551507 = 13 ⋅9427039.

It is a cyclic number.

It is not a de Polignac number, because 705155221 - 2¹ = 705155219 is a prime.

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 705155221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705155251) 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, 817615 + ... + 818476.

It is an arithmetic number, because the mean of its divisors is an integer number (176697936).

Almost surely, 2^705155221 is an apocalyptic number.

It is an amenable number.

705155221 is a deficient number, since it is larger than the sum of its proper divisors (1636523).

705155221 is a wasteful number, since it uses less digits than its factorization.

705155221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636522.

The product of its (nonzero) digits is 3500, while the sum is 28.

The square root of 705155221 is about 26554.7589143641. The cubic root of 705155221 is about 890.0783590478.

The spelling of 705155221 in words is "seven hundred five million, one hundred fifty-five thousand, two hundred twenty-one".