218561053 has 2 divisors, whose sum is σ = 218561054. Its totient is φ = 218561052.

The previous prime is 218561041. The next prime is 218561069. The reversal of 218561053 is 350165812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158684409 + 59876644 = 12597^2 + 7738^2 .

It is a cyclic number.

It is not a de Polignac number, because 218561053 - 2²¹ = 216463901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218561003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109280526 + 109280527.

It is an arithmetic number, because the mean of its divisors is an integer number (109280527).

Almost surely, 2^218561053 is an apocalyptic number.

It is an amenable number.

218561053 is a deficient number, since it is larger than the sum of its proper divisors (1).

218561053 is an equidigital number, since it uses as much as digits as its factorization.

218561053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 218561053 is about 14783.8105033851. The cubic root of 218561053 is about 602.3620344900.

The spelling of 218561053 in words is "two hundred eighteen million, five hundred sixty-one thousand, fifty-three".