243196813 has 8 divisors (see below), whose sum is σ = 255709080. Its totient is φ = 230959680.

The previous prime is 243196741. The next prime is 243196817. The reversal of 243196813 is 318691342.

It can be written as a sum of positive squares in 4 ways, for example, as 522729 + 242674084 = 723^2 + 15578^2 .

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 243196813 - 2¹⁷ = 243065741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243196817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66970 + ... + 70507.

It is an arithmetic number, because the mean of its divisors is an integer number (31963635).

Almost surely, 2^243196813 is an apocalyptic number.

It is an amenable number.

243196813 is a deficient number, since it is larger than the sum of its proper divisors (12512267).

243196813 is a wasteful number, since it uses less digits than its factorization.

243196813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137567.

The product of its digits is 31104, while the sum is 37.

The square root of 243196813 is about 15594.7687703281. The cubic root of 243196813 is about 624.1935736901.

The spelling of 243196813 in words is "two hundred forty-three million, one hundred ninety-six thousand, eight hundred thirteen".