243901745 has 8 divisors (see below), whose sum is σ = 302774760. Its totient is φ = 188392960.

The previous prime is 243901711. The next prime is 243901751. The reversal of 243901745 is 547109342.

It can be written as a sum of positive squares in 4 ways, for example, as 69872881 + 174028864 = 8359^2 + 13192^2 .

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

It is not a de Polignac number, because 243901745 - 2¹⁴ = 243885361 is a prime.

It is a super-2 number, since 2×243901745² = 118976122428090050, which contains 22 as substring.

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, 840896 + ... + 841185.

It is an arithmetic number, because the mean of its divisors is an integer number (37846845).

Almost surely, 2^243901745 is an apocalyptic number.

It is an amenable number.

243901745 is a deficient number, since it is larger than the sum of its proper divisors (58873015).

243901745 is a wasteful number, since it uses less digits than its factorization.

243901745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682115.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 243901745 is about 15617.3539692228. The cubic root of 243901745 is about 624.7960892132.

The spelling of 243901745 in words is "two hundred forty-three million, nine hundred one thousand, seven hundred forty-five".