242391757 has 2 divisors, whose sum is σ = 242391758. Its totient is φ = 242391756.

The previous prime is 242391749. The next prime is 242391769. The reversal of 242391757 is 757193242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226622916 + 15768841 = 15054^2 + 3971^2 .

It is a cyclic number.

It is not a de Polignac number, because 242391757 - 2³ = 242391749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242391707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121195878 + 121195879.

It is an arithmetic number, because the mean of its divisors is an integer number (121195879).

Almost surely, 2^242391757 is an apocalyptic number.

It is an amenable number.

242391757 is a deficient number, since it is larger than the sum of its proper divisors (1).

242391757 is an equidigital number, since it uses as much as digits as its factorization.

242391757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 40.

The square root of 242391757 is about 15568.9356412055. The cubic root of 242391757 is about 623.5040549341.

The spelling of 242391757 in words is "two hundred forty-two million, three hundred ninety-one thousand, seven hundred fifty-seven".