242540057 has 2 divisors, whose sum is σ = 242540058. Its totient is φ = 242540056.

The previous prime is 242540009. The next prime is 242540059. The reversal of 242540057 is 750045242.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228281881 + 14258176 = 15109^2 + 3776^2 .

It is a cyclic number.

It is not a de Polignac number, because 242540057 - 2²² = 238345753 is a prime.

Together with 242540059, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (242540059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121270028 + 121270029.

It is an arithmetic number, because the mean of its divisors is an integer number (121270029).

Almost surely, 2^242540057 is an apocalyptic number.

It is an amenable number.

242540057 is a deficient number, since it is larger than the sum of its proper divisors (1).

242540057 is an equidigital number, since it uses as much as digits as its factorization.

242540057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 242540057 is about 15573.6976020469. The cubic root of 242540057 is about 623.6311863204.

Adding to 242540057 its reverse (750045242), we get a palindrome (992585299).

The spelling of 242540057 in words is "two hundred forty-two million, five hundred forty thousand, fifty-seven".