243257153 has 4 divisors (see below), whose sum is σ = 245488980. Its totient is φ = 241025328.

The previous prime is 243257137. The next prime is 243257159. The reversal of 243257153 is 351752342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 174979984 + 68277169 = 13228^2 + 8263^2 .

It is a cyclic number.

It is not a de Polignac number, because 243257153 - 2⁴ = 243257137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243257159) 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, 1115750 + ... + 1115967.

It is an arithmetic number, because the mean of its divisors is an integer number (61372245).

Almost surely, 2^243257153 is an apocalyptic number.

It is an amenable number.

243257153 is a deficient number, since it is larger than the sum of its proper divisors (2231827).

243257153 is a wasteful number, since it uses less digits than its factorization.

243257153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231826.

The product of its digits is 25200, while the sum is 32.

The square root of 243257153 is about 15596.7032734485. The cubic root of 243257153 is about 624.2451926858.

The spelling of 243257153 in words is "two hundred forty-three million, two hundred fifty-seven thousand, one hundred fifty-three".