216879841 has 2 divisors, whose sum is σ = 216879842. Its totient is φ = 216879840.

The previous prime is 216879823. The next prime is 216879853. The reversal of 216879841 is 148978612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170694225 + 46185616 = 13065^2 + 6796^2 .

It is a cyclic number.

It is not a de Polignac number, because 216879841 - 2⁵ = 216879809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216879791 and 216879800.

It is not a weakly prime, because it can be changed into another prime (216879041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108439920 + 108439921.

It is an arithmetic number, because the mean of its divisors is an integer number (108439921).

Almost surely, 2^216879841 is an apocalyptic number.

It is an amenable number.

216879841 is a deficient number, since it is larger than the sum of its proper divisors (1).

216879841 is an equidigital number, since it uses as much as digits as its factorization.

216879841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 46.

The square root of 216879841 is about 14726.8408356986. The cubic root of 216879841 is about 600.8135639502.

The spelling of 216879841 in words is "two hundred sixteen million, eight hundred seventy-nine thousand, eight hundred forty-one".