243578117 has 4 divisors (see below), whose sum is σ = 245854656. Its totient is φ = 241301580.

The previous prime is 243578113. The next prime is 243578123. The reversal of 243578117 is 711875342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 711875342 = 2 ⋅355937671.

It is a cyclic number.

It is not a de Polignac number, because 243578117 - 2² = 243578113 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 (243578113) 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, 1138109 + ... + 1138322.

It is an arithmetic number, because the mean of its divisors is an integer number (61463664).

Almost surely, 2^243578117 is an apocalyptic number.

It is an amenable number.

243578117 is a deficient number, since it is larger than the sum of its proper divisors (2276539).

243578117 is a wasteful number, since it uses less digits than its factorization.

243578117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276538.

The product of its digits is 47040, while the sum is 38.

The square root of 243578117 is about 15606.9893637434. The cubic root of 243578117 is about 624.5196240502.

The spelling of 243578117 in words is "two hundred forty-three million, five hundred seventy-eight thousand, one hundred seventeen".