218530963 has 4 divisors (see below), whose sum is σ = 249749680. Its totient is φ = 187312248.

The previous prime is 218530957. The next prime is 218530967. The reversal of 218530963 is 369035812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 218530963 - 2¹³ = 218522771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218530967) 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 in 3 ways as a sum of consecutive naturals, for example, 15609348 + ... + 15609361.

It is an arithmetic number, because the mean of its divisors is an integer number (62437420).

Almost surely, 2^218530963 is an apocalyptic number.

218530963 is a deficient number, since it is larger than the sum of its proper divisors (31218717).

218530963 is an equidigital number, since it uses as much as digits as its factorization.

218530963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31218716.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 218530963 is about 14782.7928010914. The cubic root of 218530963 is about 602.3343901847.

The spelling of 218530963 in words is "two hundred eighteen million, five hundred thirty thousand, nine hundred sixty-three".