216754949 has 2 divisors, whose sum is σ = 216754950. Its totient is φ = 216754948.

The previous prime is 216754943. The next prime is 216754957. The reversal of 216754949 is 949457612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112572100 + 104182849 = 10610^2 + 10207^2 .

It is a cyclic number.

It is not a de Polignac number, because 216754949 - 2¹⁶ = 216689413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216754943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108377474 + 108377475.

It is an arithmetic number, because the mean of its divisors is an integer number (108377475).

Almost surely, 2^216754949 is an apocalyptic number.

It is an amenable number.

216754949 is a deficient number, since it is larger than the sum of its proper divisors (1).

216754949 is an equidigital number, since it uses as much as digits as its factorization.

216754949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 47.

The square root of 216754949 is about 14722.5999402279. The cubic root of 216754949 is about 600.6982140320.

The spelling of 216754949 in words is "two hundred sixteen million, seven hundred fifty-four thousand, nine hundred forty-nine".