216078829 has 2 divisors, whose sum is σ = 216078830. Its totient is φ = 216078828.

The previous prime is 216078817. The next prime is 216078883. The reversal of 216078829 is 928870612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169702729 + 46376100 = 13027^2 + 6810^2 .

It is a cyclic number.

It is not a de Polignac number, because 216078829 - 2⁷ = 216078701 is a prime.

It is a super-2 number, since 2×216078829² = 93380120684022482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216078229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108039414 + 108039415.

It is an arithmetic number, because the mean of its divisors is an integer number (108039415).

Almost surely, 2^216078829 is an apocalyptic number.

It is an amenable number.

216078829 is a deficient number, since it is larger than the sum of its proper divisors (1).

216078829 is an equidigital number, since it uses as much as digits as its factorization.

216078829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 216078829 is about 14699.6200291028. The cubic root of 216078829 is about 600.0729809374.

The spelling of 216078829 in words is "two hundred sixteen million, seventy-eight thousand, eight hundred twenty-nine".