220242557 has 2 divisors, whose sum is σ = 220242558. Its totient is φ = 220242556.

The previous prime is 220242527. The next prime is 220242577. The reversal of 220242557 is 755242022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182223001 + 38019556 = 13499^2 + 6166^2 .

It is a cyclic number.

It is not a de Polignac number, because 220242557 - 2⁶ = 220242493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220242527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110121278 + 110121279.

It is an arithmetic number, because the mean of its divisors is an integer number (110121279).

Almost surely, 2^220242557 is an apocalyptic number.

It is an amenable number.

220242557 is a deficient number, since it is larger than the sum of its proper divisors (1).

220242557 is an equidigital number, since it uses as much as digits as its factorization.

220242557 is an odious number, because the sum of its binary digits is odd.

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

The square root of 220242557 is about 14840.5713164959. The cubic root of 220242557 is about 603.9028513913.

Adding to 220242557 its reverse (755242022), we get a palindrome (975484579).

The spelling of 220242557 in words is "two hundred twenty million, two hundred forty-two thousand, five hundred fifty-seven".