216177329 has 2 divisors, whose sum is σ = 216177330. Its totient is φ = 216177328.

The previous prime is 216177323. The next prime is 216177331. The reversal of 216177329 is 923771612.

216177329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208860304 + 7317025 = 14452^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 216177329 - 2¹² = 216173233 is a prime.

Together with 216177331, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 216177292 and 216177301.

It is not a weakly prime, because it can be changed into another prime (216177323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108088664 + 108088665.

It is an arithmetic number, because the mean of its divisors is an integer number (108088665).

Almost surely, 2^216177329 is an apocalyptic number.

It is an amenable number.

216177329 is a deficient number, since it is larger than the sum of its proper divisors (1).

216177329 is an equidigital number, since it uses as much as digits as its factorization.

216177329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 38.

The square root of 216177329 is about 14702.9700741041. The cubic root of 216177329 is about 600.1641486065.

The spelling of 216177329 in words is "two hundred sixteen million, one hundred seventy-seven thousand, three hundred twenty-nine".