216909467 has 2 divisors, whose sum is σ = 216909468. Its totient is φ = 216909466.

The previous prime is 216909463. The next prime is 216909533. The reversal of 216909467 is 764909612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216909467 - 2² = 216909463 is a prime.

It is not a weakly prime, because it can be changed into another prime (216909463) 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, 108454733 + 108454734.

It is an arithmetic number, because the mean of its divisors is an integer number (108454734).

Almost surely, 2^216909467 is an apocalyptic number.

216909467 is a deficient number, since it is larger than the sum of its proper divisors (1).

216909467 is an equidigital number, since it uses as much as digits as its factorization.

216909467 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 216909467 is about 14727.8466518361. The cubic root of 216909467 is about 600.8409199462.

The spelling of 216909467 in words is "two hundred sixteen million, nine hundred nine thousand, four hundred sixty-seven".