243553297 has 8 divisors (see below), whose sum is σ = 266588840. Its totient is φ = 221132160.

The previous prime is 243553253. The next prime is 243553327. The reversal of 243553297 is 792355342.

It can be written as a sum of positive squares in 4 ways, for example, as 13242321 + 230310976 = 3639^2 + 15176^2 .

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 243553297 - 2¹¹ = 243551249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243553897) 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, 152772 + ... + 154357.

It is an arithmetic number, because the mean of its divisors is an integer number (33323605).

Almost surely, 2^243553297 is an apocalyptic number.

It is an amenable number.

243553297 is a deficient number, since it is larger than the sum of its proper divisors (23035543).

243553297 is a wasteful number, since it uses less digits than its factorization.

243553297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307203.

The product of its digits is 226800, while the sum is 40.

The square root of 243553297 is about 15606.1941869246. The cubic root of 243553297 is about 624.4984110012.

The spelling of 243553297 in words is "two hundred forty-three million, five hundred fifty-three thousand, two hundred ninety-seven".