216909463 has 2 divisors, whose sum is σ = 216909464. Its totient is φ = 216909462.

The previous prime is 216909457. The next prime is 216909467. The reversal of 216909463 is 364909612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216909463 - 2²⁵ = 183355031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216909467) 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, 108454731 + 108454732.

It is an arithmetic number, because the mean of its divisors is an integer number (108454732).

Almost surely, 2^216909463 is an apocalyptic number.

216909463 is a deficient number, since it is larger than the sum of its proper divisors (1).

216909463 is an equidigital number, since it uses as much as digits as its factorization.

216909463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 216909463 is about 14727.8465160389. The cubic root of 216909463 is about 600.8409162529.

The spelling of 216909463 in words is "two hundred sixteen million, nine hundred nine thousand, four hundred sixty-three".