216112531 has 8 divisors (see below), whose sum is σ = 226227744. Its totient is φ = 206057280.

The previous prime is 216112513. The next prime is 216112543. The reversal of 216112531 is 135211612.

It is a happy number.

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 216112531 - 2²¹ = 214015379 is a prime.

It is a super-2 number, since 2×216112531² = 93409252110451922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216112511) 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, 7530 + ... + 22111.

It is an arithmetic number, because the mean of its divisors is an integer number (28278468).

Almost surely, 2^216112531 is an apocalyptic number.

216112531 is a deficient number, since it is larger than the sum of its proper divisors (10115213).

216112531 is a wasteful number, since it uses less digits than its factorization.

216112531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29981.

The product of its digits is 360, while the sum is 22.

The square root of 216112531 is about 14700.7663405688. The cubic root of 216112531 is about 600.1041772811.

It can be divided in two parts, 21611 and 2531, that added together give a palindrome (24142).

The spelling of 216112531 in words is "two hundred sixteen million, one hundred twelve thousand, five hundred thirty-one".