242509819 has 2 divisors, whose sum is σ = 242509820. Its totient is φ = 242509818.

The previous prime is 242509753. The next prime is 242509823. The reversal of 242509819 is 918905242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242509819 - 2¹⁵ = 242477051 is a prime.

It is a super-2 number, since 2×242509819² = 117622024622825522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (242507819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121254909 + 121254910.

It is an arithmetic number, because the mean of its divisors is an integer number (121254910).

Almost surely, 2^242509819 is an apocalyptic number.

242509819 is a deficient number, since it is larger than the sum of its proper divisors (1).

242509819 is an equidigital number, since it uses as much as digits as its factorization.

242509819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 242509819 is about 15572.7267682959. The cubic root of 242509819 is about 623.6052687548.

The spelling of 242509819 in words is "two hundred forty-two million, five hundred nine thousand, eight hundred nineteen".