243995887 has 2 divisors, whose sum is σ = 243995888. Its totient is φ = 243995886.

The previous prime is 243995881. The next prime is 243995893. The reversal of 243995887 is 788599342.

It is a balanced prime because it is at equal distance from previous prime (243995881) and next prime (243995893).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243995887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243995881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121997943 + 121997944.

It is an arithmetic number, because the mean of its divisors is an integer number (121997944).

Almost surely, 2^243995887 is an apocalyptic number.

243995887 is a deficient number, since it is larger than the sum of its proper divisors (1).

243995887 is an equidigital number, since it uses as much as digits as its factorization.

243995887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 55.

The square root of 243995887 is about 15620.3676973367. The cubic root of 243995887 is about 624.8764658245.

The spelling of 243995887 in words is "two hundred forty-three million, nine hundred ninety-five thousand, eight hundred eighty-seven".