243056251 has 4 divisors (see below), whose sum is σ = 247642272. Its totient is φ = 238470232.

The previous prime is 243056243. The next prime is 243056267. The reversal of 243056251 is 152650342.

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

It is a cyclic number.

It is not a de Polignac number, because 243056251 - 2³ = 243056243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243066251) 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, 2292931 + ... + 2293036.

It is an arithmetic number, because the mean of its divisors is an integer number (61910568).

Almost surely, 2^243056251 is an apocalyptic number.

243056251 is a deficient number, since it is larger than the sum of its proper divisors (4586021).

243056251 is an equidigital number, since it uses as much as digits as its factorization.

243056251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4586020.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 243056251 is about 15590.2614153836. The cubic root of 243056251 is about 624.0732941451.

The spelling of 243056251 in words is "two hundred forty-three million, fifty-six thousand, two hundred fifty-one".