243972887 has 2 divisors, whose sum is σ = 243972888. Its totient is φ = 243972886.

The previous prime is 243972881. The next prime is 243972913. The reversal of 243972887 is 788279342.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243972887 is a prime.

It is a super-2 number, since 2×243972887² = 119045539182229538, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243972881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121986443 + 121986444.

It is an arithmetic number, because the mean of its divisors is an integer number (121986444).

Almost surely, 2^243972887 is an apocalyptic number.

243972887 is a deficient number, since it is larger than the sum of its proper divisors (1).

243972887 is an equidigital number, since it uses as much as digits as its factorization.

243972887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 50.

The square root of 243972887 is about 15619.6314617215. The cubic root of 243972887 is about 624.8568307800.

The spelling of 243972887 in words is "two hundred forty-three million, nine hundred seventy-two thousand, eight hundred eighty-seven".