216534831 has 16 divisors (see below), whose sum is σ = 306436608. Its totient is φ = 135536000.

The previous prime is 216534827. The next prime is 216534833. The reversal of 216534831 is 138435612.

It is a cyclic number.

It is not a de Polignac number, because 216534831 - 2² = 216534827 is a prime.

It is a super-2 number, since 2×216534831² = 93774666072397122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216534792 and 216534801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216534833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17056 + ... + 26906.

It is an arithmetic number, because the mean of its divisors is an integer number (19152288).

Almost surely, 2^216534831 is an apocalyptic number.

216534831 is a deficient number, since it is larger than the sum of its proper divisors (89901777).

216534831 is a wasteful number, since it uses less digits than its factorization.

216534831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10302.

The product of its digits is 17280, while the sum is 33.

The square root of 216534831 is about 14715.1225275225. The cubic root of 216534831 is about 600.4948057222.

The spelling of 216534831 in words is "two hundred sixteen million, five hundred thirty-four thousand, eight hundred thirty-one".