243457145 has 4 divisors (see below), whose sum is σ = 292148580. Its totient is φ = 194765712.

The previous prime is 243457141. The next prime is 243457171. The reversal of 243457145 is 541754342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541754342 = 2 ⋅270877171.

It can be written as a sum of positive squares in 2 ways, for example, as 189007504 + 54449641 = 13748^2 + 7379^2 .

It is a cyclic number.

It is not a de Polignac number, because 243457145 - 2² = 243457141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243457141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24345710 + ... + 24345719.

It is an arithmetic number, because the mean of its divisors is an integer number (73037145).

Almost surely, 2^243457145 is an apocalyptic number.

It is an amenable number.

243457145 is a deficient number, since it is larger than the sum of its proper divisors (48691435).

243457145 is an equidigital number, since it uses as much as digits as its factorization.

243457145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48691434.

The product of its digits is 67200, while the sum is 35.

The square root of 243457145 is about 15603.1133111312. The cubic root of 243457145 is about 624.4162186220.

The spelling of 243457145 in words is "two hundred forty-three million, four hundred fifty-seven thousand, one hundred forty-five".