242544251 has 2 divisors, whose sum is σ = 242544252. Its totient is φ = 242544250.

The previous prime is 242544191. The next prime is 242544257. The reversal of 242544251 is 152445242.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242544251 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (242544257) 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, 121272125 + 121272126.

It is an arithmetic number, because the mean of its divisors is an integer number (121272126).

Almost surely, 2^242544251 is an apocalyptic number.

242544251 is a deficient number, since it is larger than the sum of its proper divisors (1).

242544251 is an equidigital number, since it uses as much as digits as its factorization.

242544251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12800, while the sum is 29.

The square root of 242544251 is about 15573.8322515687. The cubic root of 242544251 is about 623.6347809076.

Adding to 242544251 its reverse (152445242), we get a palindrome (394989493).

Subtracting from 242544251 its reverse (152445242), we obtain a palindrome (90099009).

The spelling of 242544251 in words is "two hundred forty-two million, five hundred forty-four thousand, two hundred fifty-one".