216630411 has 4 divisors (see below), whose sum is σ = 288840552. Its totient is φ = 144420272.

The previous prime is 216630397. The next prime is 216630499. The reversal of 216630411 is 114036612.

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 216630411 - 2⁷ = 216630283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216635411) 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 in 3 ways as a sum of consecutive naturals, for example, 36105066 + ... + 36105071.

It is an arithmetic number, because the mean of its divisors is an integer number (72210138).

Almost surely, 2^216630411 is an apocalyptic number.

216630411 is a deficient number, since it is larger than the sum of its proper divisors (72210141).

216630411 is an equidigital number, since it uses as much as digits as its factorization.

216630411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72210140.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 216630411 is about 14718.3698485940. The cubic root of 216630411 is about 600.5831469380.

The spelling of 216630411 in words is "two hundred sixteen million, six hundred thirty thousand, four hundred eleven".