243220355 has 16 divisors (see below), whose sum is σ = 335314944. Its totient is φ = 165901920.

The previous prime is 243220321. The next prime is 243220363. The reversal of 243220355 is 553022342.

It is not a de Polignac number, because 243220355 - 2⁶ = 243220291 is a prime.

It is a super-2 number, since 2×243220355² = 118312282172652050, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11507 + ... + 24876.

It is an arithmetic number, because the mean of its divisors is an integer number (20957184).

Almost surely, 2^243220355 is an apocalyptic number.

243220355 is a deficient number, since it is larger than the sum of its proper divisors (92094589).

243220355 is a wasteful number, since it uses less digits than its factorization.

243220355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36586.

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 243220355 is about 15595.5235564568. The cubic root of 243220355 is about 624.2137141555.

Adding to 243220355 its reverse (553022342), we get a palindrome (796242697).

The spelling of 243220355 in words is "two hundred forty-three million, two hundred twenty thousand, three hundred fifty-five".