242749709 has 2 divisors, whose sum is σ = 242749710. Its totient is φ = 242749708.

The previous prime is 242749693. The next prime is 242749721. The reversal of 242749709 is 907947242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242674084 + 75625 = 15578^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 242749709 - 2⁴ = 242749693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 242749709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242749769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121374854 + 121374855.

It is an arithmetic number, because the mean of its divisors is an integer number (121374855).

Almost surely, 2^242749709 is an apocalyptic number.

It is an amenable number.

242749709 is a deficient number, since it is larger than the sum of its proper divisors (1).

242749709 is an equidigital number, since it uses as much as digits as its factorization.

242749709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 242749709 is about 15580.4271122457. The cubic root of 242749709 is about 623.8108238244.

The spelling of 242749709 in words is "two hundred forty-two million, seven hundred forty-nine thousand, seven hundred nine".