213663245 has 8 divisors (see below), whose sum is σ = 257698584. Its totient is φ = 170062144.

The previous prime is 213663239. The next prime is 213663251. The reversal of 213663245 is 542366312.

It is an interprime number because it is at equal distance from previous prime (213663239) and next prime (213663251).

It can be written as a sum of positive squares in 4 ways, for example, as 81252196 + 132411049 = 9014^2 + 11507^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213663245 - 2⁶ = 213663181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107474 + ... + 109443.

It is an arithmetic number, because the mean of its divisors is an integer number (32212323).

Almost surely, 2^213663245 is an apocalyptic number.

It is an amenable number.

213663245 is a deficient number, since it is larger than the sum of its proper divisors (44035339).

213663245 is a wasteful number, since it uses less digits than its factorization.

213663245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217119.

The product of its digits is 25920, while the sum is 32.

The square root of 213663245 is about 14617.2242577036. The cubic root of 213663245 is about 597.8284883393.

The spelling of 213663245 in words is "two hundred thirteen million, six hundred sixty-three thousand, two hundred forty-five".