216531654 has 16 divisors (see below), whose sum is σ = 433920240. Its totient is φ = 72034400.

The previous prime is 216531643. The next prime is 216531677. The reversal of 216531654 is 456135612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32397 + ... + 38504.

It is an arithmetic number, because the mean of its divisors is an integer number (27120015).

Almost surely, 2^216531654 is an apocalyptic number.

216531654 is an abundant number, since it is smaller than the sum of its proper divisors (217388586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216531654 is a wasteful number, since it uses less digits than its factorization.

216531654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71415.

The product of its digits is 21600, while the sum is 33.

The square root of 216531654 is about 14715.0145769551. The cubic root of 216531654 is about 600.4918688870.

The spelling of 216531654 in words is "two hundred sixteen million, five hundred thirty-one thousand, six hundred fifty-four".