216298081 has 2 divisors, whose sum is σ = 216298082. Its totient is φ = 216298080.

The previous prime is 216298063. The next prime is 216298091. The reversal of 216298081 is 180892612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143041600 + 73256481 = 11960^2 + 8559^2 .

It is a cyclic number.

It is not a de Polignac number, because 216298081 - 2⁹ = 216297569 is a prime.

It is a super-2 number, since 2×216298081² = 93569719688565122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216298081.

It is not a weakly prime, because it can be changed into another prime (216298031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108149040 + 108149041.

It is an arithmetic number, because the mean of its divisors is an integer number (108149041).

Almost surely, 2^216298081 is an apocalyptic number.

It is an amenable number.

216298081 is a deficient number, since it is larger than the sum of its proper divisors (1).

216298081 is an equidigital number, since it uses as much as digits as its factorization.

216298081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 216298081 is about 14707.0758820372. The cubic root of 216298081 is about 600.2758740623.

The spelling of 216298081 in words is "two hundred sixteen million, two hundred ninety-eight thousand, eighty-one".