213808613 has 4 divisors (see below), whose sum is σ = 213838380. Its totient is φ = 213778848.

The previous prime is 213808589. The next prime is 213808663. The reversal of 213808613 is 316808312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 138344644 + 75463969 = 11762^2 + 8687^2 .

It is a cyclic number.

It is not a de Polignac number, because 213808613 - 2¹⁶ = 213743077 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 213808613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213808663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3281 + ... + 20937.

It is an arithmetic number, because the mean of its divisors is an integer number (53459595).

Almost surely, 2^213808613 is an apocalyptic number.

It is an amenable number.

213808613 is a deficient number, since it is larger than the sum of its proper divisors (29767).

213808613 is a wasteful number, since it uses less digits than its factorization.

213808613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29766.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 213808613 is about 14622.1959021209. The cubic root of 213808613 is about 597.9640372030.

The spelling of 213808613 in words is "two hundred thirteen million, eight hundred eight thousand, six hundred thirteen".