242648821 has 2 divisors, whose sum is σ = 242648822. Its totient is φ = 242648820.

The previous prime is 242648807. The next prime is 242648831. The reversal of 242648821 is 128846242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242144721 + 504100 = 15561^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 242648821 - 2²¹ = 240551669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242648801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121324410 + 121324411.

It is an arithmetic number, because the mean of its divisors is an integer number (121324411).

Almost surely, 2^242648821 is an apocalyptic number.

It is an amenable number.

242648821 is a deficient number, since it is larger than the sum of its proper divisors (1).

242648821 is an equidigital number, since it uses as much as digits as its factorization.

242648821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49152, while the sum is 37.

The square root of 242648821 is about 15577.1891238439. The cubic root of 242648821 is about 623.7243922108.

The spelling of 242648821 in words is "two hundred forty-two million, six hundred forty-eight thousand, eight hundred twenty-one".