216534431 has 8 divisors (see below), whose sum is σ = 228071280. Its totient is φ = 205011648.

The previous prime is 216534421. The next prime is 216534433. The reversal of 216534431 is 134435612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216534431 - 2¹⁴ = 216518047 is a prime.

It is a super-2 number, since 2×216534431² = 93774319616987522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216534394 and 216534403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216534433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46355 + ... + 50811.

It is an arithmetic number, because the mean of its divisors is an integer number (28508910).

Almost surely, 2^216534431 is an apocalyptic number.

216534431 is a deficient number, since it is larger than the sum of its proper divisors (11536849).

216534431 is a wasteful number, since it uses less digits than its factorization.

216534431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7033.

The product of its digits is 8640, while the sum is 29.

The square root of 216534431 is about 14715.1089360562. The cubic root of 216534431 is about 600.4944359617.

The spelling of 216534431 in words is "two hundred sixteen million, five hundred thirty-four thousand, four hundred thirty-one".