209216469 has 32 divisors (see below), whose sum is σ = 359792640. Its totient is φ = 104932800.

The previous prime is 209216459. The next prime is 209216479. The reversal of 209216469 is 964612902.

It is an interprime number because it is at equal distance from previous prime (209216459) and next prime (209216479).

It is not a de Polignac number, because 209216469 - 2⁷ = 209216341 is a prime.

It is a super-2 number, since 2×209216469² = 87543061801655922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209216459) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8917 + ... + 22314.

It is an arithmetic number, because the mean of its divisors is an integer number (11243520).

Almost surely, 2^209216469 is an apocalyptic number.

209216469 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

209216469 is a deficient number, since it is larger than the sum of its proper divisors (150576171).

209216469 is a wasteful number, since it uses less digits than its factorization.

209216469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31281.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 209216469 is about 14464.3170941459. The cubic root of 209216469 is about 593.6520283928.

The spelling of 209216469 in words is "two hundred nine million, two hundred sixteen thousand, four hundred sixty-nine".