216879853 has 2 divisors, whose sum is σ = 216879854. Its totient is φ = 216879852.

The previous prime is 216879841. The next prime is 216879899. The reversal of 216879853 is 358978612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145612489 + 71267364 = 12067^2 + 8442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216879853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216879797 and 216879806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216879823) 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, 108439926 + 108439927.

It is an arithmetic number, because the mean of its divisors is an integer number (108439927).

Almost surely, 2^216879853 is an apocalyptic number.

It is an amenable number.

216879853 is a deficient number, since it is larger than the sum of its proper divisors (1).

216879853 is an equidigital number, since it uses as much as digits as its factorization.

216879853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 49.

The square root of 216879853 is about 14726.8412431180. The cubic root of 216879853 is about 600.8135750312.

The spelling of 216879853 in words is "two hundred sixteen million, eight hundred seventy-nine thousand, eight hundred fifty-three".