242573809 has 2 divisors, whose sum is σ = 242573810. Its totient is φ = 242573808.

The previous prime is 242573797. The next prime is 242573873. The reversal of 242573809 is 908375242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193293409 + 49280400 = 13903^2 + 7020^2 .

It is a cyclic number.

It is not a de Polignac number, because 242573809 - 2⁹ = 242573297 is a prime.

It is not a weakly prime, because it can be changed into another prime (242573509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121286904 + 121286905.

It is an arithmetic number, because the mean of its divisors is an integer number (121286905).

Almost surely, 2^242573809 is an apocalyptic number.

It is an amenable number.

242573809 is a deficient number, since it is larger than the sum of its proper divisors (1).

242573809 is an equidigital number, since it uses as much as digits as its factorization.

242573809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 242573809 is about 15574.7811862639. The cubic root of 242573809 is about 623.6601132583.

The spelling of 242573809 in words is "two hundred forty-two million, five hundred seventy-three thousand, eight hundred nine".