243149761 has 2 divisors, whose sum is σ = 243149762. Its totient is φ = 243149760.

The previous prime is 243149749. The next prime is 243149773. The reversal of 243149761 is 167941342.

It is a balanced prime because it is at equal distance from previous prime (243149749) and next prime (243149773).

It can be written as a sum of positive squares in only one way, i.e., 240839361 + 2310400 = 15519^2 + 1520^2 .

It is a cyclic number.

It is not a de Polignac number, because 243149761 - 2⁵ = 243149729 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243149761.

It is not a weakly prime, because it can be changed into another prime (243149741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121574880 + 121574881.

It is an arithmetic number, because the mean of its divisors is an integer number (121574881).

Almost surely, 2^243149761 is an apocalyptic number.

It is an amenable number.

243149761 is a deficient number, since it is larger than the sum of its proper divisors (1).

243149761 is an equidigital number, since it uses as much as digits as its factorization.

243149761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 243149761 is about 15593.2601145495. The cubic root of 243149761 is about 624.1533162405.

The spelling of 243149761 in words is "two hundred forty-three million, one hundred forty-nine thousand, seven hundred sixty-one".