216780371 has 2 divisors, whose sum is σ = 216780372. Its totient is φ = 216780370.

The previous prime is 216780349. The next prime is 216780391. The reversal of 216780371 is 173087612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216780371 - 2¹⁸ = 216518227 is a prime.

It is not a weakly prime, because it can be changed into another prime (216780301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108390185 + 108390186.

It is an arithmetic number, because the mean of its divisors is an integer number (108390186).

Almost surely, 2^216780371 is an apocalyptic number.

216780371 is a deficient number, since it is larger than the sum of its proper divisors (1).

216780371 is an equidigital number, since it uses as much as digits as its factorization.

216780371 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 216780371 is about 14723.4632814430. The cubic root of 216780371 is about 600.7216973143.

The spelling of 216780371 in words is "two hundred sixteen million, seven hundred eighty thousand, three hundred seventy-one".