242278913 has 2 divisors, whose sum is σ = 242278914. Its totient is φ = 242278912.

The previous prime is 242278889. The next prime is 242278961. The reversal of 242278913 is 319872242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206554384 + 35724529 = 14372^2 + 5977^2 .

It is a cyclic number.

It is not a de Polignac number, because 242278913 - 2⁸ = 242278657 is a prime.

It is not a weakly prime, because it can be changed into another prime (242278973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121139456 + 121139457.

It is an arithmetic number, because the mean of its divisors is an integer number (121139457).

Almost surely, 2^242278913 is an apocalyptic number.

It is an amenable number.

242278913 is a deficient number, since it is larger than the sum of its proper divisors (1).

242278913 is an equidigital number, since it uses as much as digits as its factorization.

242278913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 242278913 is about 15565.3112079393. The cubic root of 242278913 is about 623.4072837490.

The spelling of 242278913 in words is "two hundred forty-two million, two hundred seventy-eight thousand, nine hundred thirteen".