216309473 has 2 divisors, whose sum is σ = 216309474. Its totient is φ = 216309472.

The previous prime is 216309469. The next prime is 216309487. The reversal of 216309473 is 374903612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213510544 + 2798929 = 14612^2 + 1673^2 .

It is a cyclic number.

It is not a de Polignac number, because 216309473 - 2² = 216309469 is a prime.

It is not a weakly prime, because it can be changed into another prime (216309403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108154736 + 108154737.

It is an arithmetic number, because the mean of its divisors is an integer number (108154737).

Almost surely, 2^216309473 is an apocalyptic number.

It is an amenable number.

216309473 is a deficient number, since it is larger than the sum of its proper divisors (1).

216309473 is an equidigital number, since it uses as much as digits as its factorization.

216309473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 216309473 is about 14707.4631735048. The cubic root of 216309473 is about 600.2864123323.

The spelling of 216309473 in words is "two hundred sixteen million, three hundred nine thousand, four hundred seventy-three".