243442101 has 16 divisors (see below), whose sum is σ = 382926848. Its totient is φ = 134622000.

The previous prime is 243442063. The next prime is 243442127. The reversal of 243442101 is 101244342.

It is not a de Polignac number, because 243442101 - 2⁷ = 243441973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243442141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186325 + ... + 187626.

It is an arithmetic number, because the mean of its divisors is an integer number (23932928).

Almost surely, 2^243442101 is an apocalyptic number.

243442101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

243442101 is a deficient number, since it is larger than the sum of its proper divisors (139484747).

243442101 is a wasteful number, since it uses less digits than its factorization.

243442101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373992.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 243442101 is about 15602.6312204064. The cubic root of 243442101 is about 624.4033567949.

Adding to 243442101 its reverse (101244342), we get a palindrome (344686443).

The spelling of 243442101 in words is "two hundred forty-three million, four hundred forty-two thousand, one hundred one".