216329031 has 12 divisors (see below), whose sum is σ = 313304680. Its totient is φ = 143836560.

The previous prime is 216329021. The next prime is 216329033. The reversal of 216329031 is 130923612.

216329031 is a `hidden beast` number, since 21 + 632 + 9 + 0 + 3 + 1 = 666.

It is not a de Polignac number, because 216329031 - 2⁵ = 216328999 is a prime.

It is a super-2 number, since 2×216329031² = 93596499306797922, 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 = 216328986 and 216329004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216329033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28300 + ... + 35121.

Almost surely, 2^216329031 is an apocalyptic number.

216329031 is a deficient number, since it is larger than the sum of its proper divisors (96975649).

216329031 is a wasteful number, since it uses less digits than its factorization.

216329031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63806 (or 63803 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 216329031 is about 14708.1280590019. The cubic root of 216329031 is about 600.3045037696.

The spelling of 216329031 in words is "two hundred sixteen million, three hundred twenty-nine thousand, thirty-one".