216131643 has 48 divisors (see below), whose sum is σ = 386830080. Its totient is φ = 113234112.

The previous prime is 216131633. The next prime is 216131651. The reversal of 216131643 is 346131612.

216131643 is a `hidden beast` number, since 2 + 1 + 6 + 13 + 1 + 643 = 666.

It is not a de Polignac number, because 216131643 - 2⁶ = 216131579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216131633) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132688 + ... + 134306.

It is an arithmetic number, because the mean of its divisors is an integer number (8058960).

Almost surely, 2^216131643 is an apocalyptic number.

216131643 is a deficient number, since it is larger than the sum of its proper divisors (170698437).

216131643 is a wasteful number, since it uses less digits than its factorization.

216131643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808 (or 1805 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 216131643 is about 14701.4163603375. The cubic root of 216131643 is about 600.1218669124.

The spelling of 216131643 in words is "two hundred sixteen million, one hundred thirty-one thousand, six hundred forty-three".