242991719 has 2 divisors, whose sum is σ = 242991720. Its totient is φ = 242991718.

The previous prime is 242991643. The next prime is 242991787. The reversal of 242991719 is 917199242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242991719 - 2¹² = 242987623 is a prime.

It is a super-2 number, since 2×242991719² = 118089951005149922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 242991719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242997719) 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, 121495859 + 121495860.

It is an arithmetic number, because the mean of its divisors is an integer number (121495860).

Almost surely, 2^242991719 is an apocalyptic number.

242991719 is a deficient number, since it is larger than the sum of its proper divisors (1).

242991719 is an equidigital number, since it uses as much as digits as its factorization.

242991719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 242991719 is about 15588.1916526581. The cubic root of 242991719 is about 624.0180582860.

The spelling of 242991719 in words is "two hundred forty-two million, nine hundred ninety-one thousand, seven hundred nineteen".