216043531 has 16 divisors (see below), whose sum is σ = 260402688. Its totient is φ = 176809600.

The previous prime is 216043511. The next prime is 216043561. The reversal of 216043531 is 135340612.

It is not a de Polignac number, because 216043531 - 2⁷ = 216043403 is a prime.

It is a super-2 number, since 2×216043531² = 93349614573895922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216043496 and 216043505.

It is not an unprimeable number, because it can be changed into a prime (216043511) 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, 20815 + ... + 29416.

It is an arithmetic number, because the mean of its divisors is an integer number (16275168).

Almost surely, 2^216043531 is an apocalyptic number.

216043531 is a deficient number, since it is larger than the sum of its proper divisors (44359157).

216043531 is a wasteful number, since it uses less digits than its factorization.

216043531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50282.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 216043531 is about 14698.4193367858. The cubic root of 216043531 is about 600.0403037741.

The spelling of 216043531 in words is "two hundred sixteen million, forty-three thousand, five hundred thirty-one".