216449477 has 2 divisors, whose sum is σ = 216449478. Its totient is φ = 216449476.

The previous prime is 216449473. The next prime is 216449479. The reversal of 216449477 is 774944612.

216449477 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., 214300321 + 2149156 = 14639^2 + 1466^2 .

It is a cyclic number.

It is not a de Polignac number, because 216449477 - 2² = 216449473 is a prime.

Together with 216449479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216449473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108224738 + 108224739.

It is an arithmetic number, because the mean of its divisors is an integer number (108224739).

Almost surely, 2^216449477 is an apocalyptic number.

It is an amenable number.

216449477 is a deficient number, since it is larger than the sum of its proper divisors (1).

216449477 is an equidigital number, since it uses as much as digits as its factorization.

216449477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 44.

The square root of 216449477 is about 14712.2220279603. Note that the first 3 decimals coincide. The cubic root of 216449477 is about 600.4158940610.

The spelling of 216449477 in words is "two hundred sixteen million, four hundred forty-nine thousand, four hundred seventy-seven".