218022557 has 2 divisors, whose sum is σ = 218022558. Its totient is φ = 218022556.

The previous prime is 218022449. The next prime is 218022583. The reversal of 218022557 is 755220812.

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., 215678596 + 2343961 = 14686^2 + 1531^2 .

It is a cyclic number.

It is not a de Polignac number, because 218022557 - 2¹⁰ = 218021533 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 (218022157) 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, 109011278 + 109011279.

It is an arithmetic number, because the mean of its divisors is an integer number (109011279).

Almost surely, 2^218022557 is an apocalyptic number.

It is an amenable number.

218022557 is a deficient number, since it is larger than the sum of its proper divisors (1).

218022557 is an equidigital number, since it uses as much as digits as its factorization.

218022557 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 32.

The square root of 218022557 is about 14765.5869168821. The cubic root of 218022557 is about 601.8669229359.

The spelling of 218022557 in words is "two hundred eighteen million, twenty-two thousand, five hundred fifty-seven".