216581469 has 32 divisors (see below), whose sum is σ = 322560000. Its totient is φ = 128364480.

The previous prime is 216581447. The next prime is 216581473. The reversal of 216581469 is 964185612.

It is not a de Polignac number, because 216581469 - 2⁷ = 216581341 is a prime.

It is a super-2 number, since 2×216581469² = 93815065428395922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216581469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216581429) 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, 433782 + ... + 434280.

It is an arithmetic number, because the mean of its divisors is an integer number (10080000).

Almost surely, 2^216581469 is an apocalyptic number.

It is an amenable number.

216581469 is a deficient number, since it is larger than the sum of its proper divisors (105978531).

216581469 is a wasteful number, since it uses less digits than its factorization.

216581469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905.

The product of its digits is 103680, while the sum is 42.

The square root of 216581469 is about 14716.7071384872. The cubic root of 216581469 is about 600.5379148242.

The spelling of 216581469 in words is "two hundred sixteen million, five hundred eighty-one thousand, four hundred sixty-nine".