242663857 has 2 divisors, whose sum is σ = 242663858. Its totient is φ = 242663856.

The previous prime is 242663807. The next prime is 242663879. The reversal of 242663857 is 758366242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130325056 + 112338801 = 11416^2 + 10599^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242663857 is a prime.

It is not a weakly prime, because it can be changed into another prime (242663807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121331928 + 121331929.

It is an arithmetic number, because the mean of its divisors is an integer number (121331929).

Almost surely, 2^242663857 is an apocalyptic number.

It is an amenable number.

242663857 is a deficient number, since it is larger than the sum of its proper divisors (1).

242663857 is an equidigital number, since it uses as much as digits as its factorization.

242663857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 43.

The square root of 242663857 is about 15577.6717451614. The cubic root of 242663857 is about 623.7372751998.

The spelling of 242663857 in words is "two hundred forty-two million, six hundred sixty-three thousand, eight hundred fifty-seven".