216877 has 2 divisors, whose sum is σ = 216878. Its totient is φ = 216876.

The previous prime is 216859. The next prime is 216899. The reversal of 216877 is 778612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212521 + 4356 = 461^2 + 66^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108438 + 108439.

It is an arithmetic number, because the mean of its divisors is an integer number (108439).

2²¹⁶⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

216877 is a deficient number, since it is larger than the sum of its proper divisors (1).

216877 is an equidigital number, since it uses as much as digits as its factorization.

216877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 31.

The square root of 216877 is about 465.7005475625. The cubic root of 216877 is about 60.0810940502.

The spelling of 216877 in words is "two hundred sixteen thousand, eight hundred seventy-seven".