242521001 has 2 divisors, whose sum is σ = 242521002. Its totient is φ = 242521000.

The previous prime is 242520991. The next prime is 242521009. The reversal of 242521001 is 100125242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132250000 + 110271001 = 11500^2 + 10501^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242521001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (242521009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121260500 + 121260501.

It is an arithmetic number, because the mean of its divisors is an integer number (121260501).

Almost surely, 2^242521001 is an apocalyptic number.

It is an amenable number.

242521001 is a deficient number, since it is larger than the sum of its proper divisors (1).

242521001 is an equidigital number, since it uses as much as digits as its factorization.

242521001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 242521001 is about 15573.0857892712. The cubic root of 242521001 is about 623.6148533110.

Adding to 242521001 its reverse (100125242), we get a palindrome (342646243).

The spelling of 242521001 in words is "two hundred forty-two million, five hundred twenty-one thousand, one".