213913705 has 4 divisors (see below), whose sum is σ = 256696452. Its totient is φ = 171130960.

The previous prime is 213913643. The next prime is 213913741. The reversal of 213913705 is 507319312.

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 90326016 + 123587689 = 9504^2 + 11117^2 .

It is not a de Polignac number, because 213913705 - 2⁷ = 213913577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21391366 + ... + 21391375.

It is an arithmetic number, because the mean of its divisors is an integer number (64174113).

Almost surely, 2^213913705 is an apocalyptic number.

It is an amenable number.

213913705 is a deficient number, since it is larger than the sum of its proper divisors (42782747).

213913705 is an equidigital number, since it uses as much as digits as its factorization.

213913705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42782746.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 213913705 is about 14625.7890385442. The cubic root of 213913705 is about 598.0619923205.

The spelling of 213913705 in words is "two hundred thirteen million, nine hundred thirteen thousand, seven hundred five".