243251153 has 4 divisors (see below), whose sum is σ = 243575808. Its totient is φ = 242926500.

The previous prime is 243251123. The next prime is 243251201. The reversal of 243251153 is 351152342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 351152342 = 2 ⋅175576171.

It is a cyclic number.

It is not a de Polignac number, because 243251153 - 2¹⁴ = 243234769 is a prime.

It is a super-2 number, since 2×243251153² = 118342246871658818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243251123) 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, 161201 + ... + 162702.

It is an arithmetic number, because the mean of its divisors is an integer number (60893952).

Almost surely, 2^243251153 is an apocalyptic number.

It is an amenable number.

243251153 is a deficient number, since it is larger than the sum of its proper divisors (324655).

243251153 is an equidigital number, since it uses as much as digits as its factorization.

243251153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324654.

The product of its digits is 3600, while the sum is 26.

The square root of 243251153 is about 15596.5109239214. The cubic root of 243251153 is about 624.2400602544.

The spelling of 243251153 in words is "two hundred forty-three million, two hundred fifty-one thousand, one hundred fifty-three".