243042251 has 8 divisors (see below), whose sum is σ = 257482800. Its totient is φ = 228617728.

The previous prime is 243042229. The next prime is 243042257. The reversal of 243042251 is 152240342.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 243042251 - 2⁶ = 243042187 is a prime.

It is a super-2 number, since 2×243042251² = 118139071542294002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243042257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43235 + ... + 48531.

It is an arithmetic number, because the mean of its divisors is an integer number (32185350).

Almost surely, 2^243042251 is an apocalyptic number.

243042251 is a deficient number, since it is larger than the sum of its proper divisors (14440549).

243042251 is a wasteful number, since it uses less digits than its factorization.

243042251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8013.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 243042251 is about 15589.8124106738. The cubic root of 243042251 is about 624.0613117421.

Adding to 243042251 its reverse (152240342), we get a palindrome (395282593).

The spelling of 243042251 in words is "two hundred forty-three million, forty-two thousand, two hundred fifty-one".