216506132 has 6 divisors (see below), whose sum is σ = 378885738. Its totient is φ = 108253064.

The previous prime is 216506123. The next prime is 216506137. The reversal of 216506132 is 231605612.

It can be written as a sum of positive squares in only one way, i.e., 178115716 + 38390416 = 13346^2 + 6196^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216506137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27063263 + ... + 27063270.

It is an arithmetic number, because the mean of its divisors is an integer number (63147623).

Almost surely, 2^216506132 is an apocalyptic number.

It is an amenable number.

216506132 is a deficient number, since it is larger than the sum of its proper divisors (162379606).

216506132 is a wasteful number, since it uses less digits than its factorization.

216506132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54126537 (or 54126535 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 216506132 is about 14714.1473419291. The cubic root of 216506132 is about 600.4682751763.

The spelling of 216506132 in words is "two hundred sixteen million, five hundred six thousand, one hundred thirty-two".