243505101 has 16 divisors (see below), whose sum is σ = 373981184. Its totient is φ = 138048624.

The previous prime is 243505099. The next prime is 243505147. The reversal of 243505101 is 101505342.

It is not a de Polignac number, because 243505101 - 2¹ = 243505099 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 (243505181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42985 + ... + 48318.

It is an arithmetic number, because the mean of its divisors is an integer number (23373824).

Almost surely, 2^243505101 is an apocalyptic number.

243505101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

243505101 is a deficient number, since it is larger than the sum of its proper divisors (130476083).

243505101 is a wasteful number, since it uses less digits than its factorization.

243505101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91440.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 243505101 is about 15604.6499800540. The cubic root of 243505101 is about 624.4572149381.

The spelling of 243505101 in words is "two hundred forty-three million, five hundred five thousand, one hundred one".