241221557 has 2 divisors, whose sum is σ = 241221558. Its totient is φ = 241221556.

The previous prime is 241221527. The next prime is 241221569. The reversal of 241221557 is 755122142.

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., 240591121 + 630436 = 15511^2 + 794^2 .

It is a cyclic number.

It is not a de Polignac number, because 241221557 - 2⁸ = 241221301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (241221527) 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, 120610778 + 120610779.

It is an arithmetic number, because the mean of its divisors is an integer number (120610779).

Almost surely, 2^241221557 is an apocalyptic number.

It is an amenable number.

241221557 is a deficient number, since it is larger than the sum of its proper divisors (1).

241221557 is an equidigital number, since it uses as much as digits as its factorization.

241221557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5600, while the sum is 29.

The square root of 241221557 is about 15531.3089274536. The cubic root of 241221557 is about 622.4990678631.

Adding to 241221557 its reverse (755122142), we get a palindrome (996343699).

The spelling of 241221557 in words is "two hundred forty-one million, two hundred twenty-one thousand, five hundred fifty-seven".