243695789 has 2 divisors, whose sum is σ = 243695790. Its totient is φ = 243695788.

The previous prime is 243695747. The next prime is 243695797. The reversal of 243695789 is 987596342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152646025 + 91049764 = 12355^2 + 9542^2 .

It is a cyclic number.

It is not a de Polignac number, because 243695789 - 2⁸ = 243695533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243695789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243695689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121847894 + 121847895.

It is an arithmetic number, because the mean of its divisors is an integer number (121847895).

Almost surely, 2^243695789 is an apocalyptic number.

It is an amenable number.

243695789 is a deficient number, since it is larger than the sum of its proper divisors (1).

243695789 is an equidigital number, since it uses as much as digits as its factorization.

243695789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 53.

The square root of 243695789 is about 15610.7587579848. The cubic root of 243695789 is about 624.6201758339.

The spelling of 243695789 in words is "two hundred forty-three million, six hundred ninety-five thousand, seven hundred eighty-nine".