216464329 has 2 divisors, whose sum is σ = 216464330. Its totient is φ = 216464328.

The previous prime is 216464291. The next prime is 216464341. The reversal of 216464329 is 923464612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114918400 + 101545929 = 10720^2 + 10077^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216464329 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216464629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108232164 + 108232165.

It is an arithmetic number, because the mean of its divisors is an integer number (108232165).

Almost surely, 2^216464329 is an apocalyptic number.

It is an amenable number.

216464329 is a deficient number, since it is larger than the sum of its proper divisors (1).

216464329 is an equidigital number, since it uses as much as digits as its factorization.

216464329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 37.

The square root of 216464329 is about 14712.7267697052. The cubic root of 216464329 is about 600.4296265542.

The spelling of 216464329 in words is "two hundred sixteen million, four hundred sixty-four thousand, three hundred twenty-nine".