213553705 has 4 divisors (see below), whose sum is σ = 256264452.
Its totient is φ = 170842960.
The previous prime is 213553679. The next prime is 213553757. The reversal of 213553705 is 507355312.
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 99042304 + 114511401 = 9952^2 + 10701^2
It is not a de Polignac number, because 213553705 - 219 = 213029417 is a prime.
It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is a Duffinian number.
It is an unprimeable number.
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, 21355366 + ... + 21355375.
It is an arithmetic number, because the mean of its divisors is an integer number (64066113).
Almost surely, 2213553705 is an apocalyptic number.
It is an amenable number.
213553705 is a deficient number, since it is larger than the sum of its proper divisors (42710747).
213553705 is an equidigital number, since it uses as much as digits as its factorization.
213553705 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 42710746.
The product of its (nonzero) digits is 15750, while the sum is 31.
The square root of 213553705 is about 14613.4768279147.
The cubic root of 213553705 is about 597.7263067859.
The spelling of 213553705 in words is "two hundred thirteen million, five hundred fifty-three thousand, seven hundred five".