242778973 has 2 divisors, whose sum is σ = 242778974. Its totient is φ = 242778972.

The previous prime is 242778971. The next prime is 242778983. The reversal of 242778973 is 379877242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242051364 + 727609 = 15558^2 + 853^2 .

It is a cyclic number.

It is not a de Polignac number, because 242778973 - 2¹ = 242778971 is a prime.

Together with 242778971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242778971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121389486 + 121389487.

It is an arithmetic number, because the mean of its divisors is an integer number (121389487).

Almost surely, 2^242778973 is an apocalyptic number.

It is an amenable number.

242778973 is a deficient number, since it is larger than the sum of its proper divisors (1).

242778973 is an equidigital number, since it uses as much as digits as its factorization.

242778973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1185408, while the sum is 49.

The square root of 242778973 is about 15581.3662109585. The cubic root of 242778973 is about 623.8358900631.

The spelling of 242778973 in words is "two hundred forty-two million, seven hundred seventy-eight thousand, nine hundred seventy-three".