243155105 has 8 divisors (see below), whose sum is σ = 291876264. Its totient is φ = 194464000.

The previous prime is 243155071. The next prime is 243155117. The reversal of 243155105 is 501551342.

It can be written as a sum of positive squares in 4 ways, for example, as 85803169 + 157351936 = 9263^2 + 12544^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-243155105 is a prime.

It is a super-2 number, since 2×243155105² = 118248810175122050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18455 + ... + 28755.

It is an arithmetic number, because the mean of its divisors is an integer number (36484533).

Almost surely, 2^243155105 is an apocalyptic number.

It is an amenable number.

243155105 is a deficient number, since it is larger than the sum of its proper divisors (48721159).

243155105 is a wasteful number, since it uses less digits than its factorization.

243155105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15027.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 243155105 is about 15593.4314696926. The cubic root of 243155105 is about 624.1578888009.

The spelling of 243155105 in words is "two hundred forty-three million, one hundred fifty-five thousand, one hundred five".