216451 has 2 divisors, whose sum is σ = 216452. Its totient is φ = 216450.

The previous prime is 216431. The next prime is 216481. The reversal of 216451 is 154612.

216451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216451 - 2⁹ = 215939 is a prime.

It is not a weakly prime, because it can be changed into another prime (216401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108225 + 108226.

It is an arithmetic number, because the mean of its divisors is an integer number (108226).

2²¹⁶⁴⁵¹ is an apocalyptic number.

216451 is a deficient number, since it is larger than the sum of its proper divisors (1).

216451 is an equidigital number, since it uses as much as digits as its factorization.

216451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 19.

The square root of 216451 is about 465.2429472867. The cubic root of 216451 is about 60.0417302290.

The spelling of 216451 in words is "two hundred sixteen thousand, four hundred fifty-one".