242042551 has 2 divisors, whose sum is σ = 242042552. Its totient is φ = 242042550.

The previous prime is 242042509. The next prime is 242042579. The reversal of 242042551 is 155240242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242042551 - 2²⁷ = 107824823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242042351) 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, 121021275 + 121021276.

It is an arithmetic number, because the mean of its divisors is an integer number (121021276).

Almost surely, 2^242042551 is an apocalyptic number.

242042551 is a deficient number, since it is larger than the sum of its proper divisors (1).

242042551 is an equidigital number, since it uses as much as digits as its factorization.

242042551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 242042551 is about 15557.7167669295. The cubic root of 242042551 is about 623.2044902913.

Adding to 242042551 its reverse (155240242), we get a palindrome (397282793).

The spelling of 242042551 in words is "two hundred forty-two million, forty-two thousand, five hundred fifty-one".