218530453 has 2 divisors, whose sum is σ = 218530454. Its totient is φ = 218530452.

The previous prime is 218530447. The next prime is 218530463. The reversal of 218530453 is 354035812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215003569 + 3526884 = 14663^2 + 1878^2 .

It is a cyclic number.

It is not a de Polignac number, because 218530453 - 2⁵ = 218530421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218530423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109265226 + 109265227.

It is an arithmetic number, because the mean of its divisors is an integer number (109265227).

Almost surely, 2^218530453 is an apocalyptic number.

It is an amenable number.

218530453 is a deficient number, since it is larger than the sum of its proper divisors (1).

218530453 is an equidigital number, since it uses as much as digits as its factorization.

218530453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 218530453 is about 14782.7755512962. The cubic root of 218530453 is about 602.3339216153. Note that the first 3 decimals are identical.

The spelling of 218530453 in words is "two hundred eighteen million, five hundred thirty thousand, four hundred fifty-three".