216909469 has 16 divisors (see below), whose sum is σ = 250329600. Its totient is φ = 184109184.

The previous prime is 216909467. The next prime is 216909533. The reversal of 216909469 is 964909612.

It is not a de Polignac number, because 216909469 - 2¹ = 216909467 is a prime.

It is a super-2 number, since 2×216909469² = 94099435483723922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a 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 in 15 ways as a sum of consecutive naturals, for example, 530137 + ... + 530545.

It is an arithmetic number, because the mean of its divisors is an integer number (15645600).

Almost surely, 2^216909469 is an apocalyptic number.

It is an amenable number.

216909469 is a deficient number, since it is larger than the sum of its proper divisors (33420131).

216909469 is a wasteful number, since it uses less digits than its factorization.

216909469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 216909469 is about 14727.8467197347. The cubic root of 216909469 is about 600.8409217929.

The spelling of 216909469 in words is "two hundred sixteen million, nine hundred nine thousand, four hundred sixty-nine".