216273913 has 2 divisors, whose sum is σ = 216273914. Its totient is φ = 216273912.

The previous prime is 216273877. The next prime is 216273919. The reversal of 216273913 is 319372612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171007929 + 45265984 = 13077^2 + 6728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216273913 is a prime.

It is not a weakly prime, because it can be changed into another prime (216273919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108136956 + 108136957.

It is an arithmetic number, because the mean of its divisors is an integer number (108136957).

Almost surely, 2^216273913 is an apocalyptic number.

It is an amenable number.

216273913 is a deficient number, since it is larger than the sum of its proper divisors (1).

216273913 is an equidigital number, since it uses as much as digits as its factorization.

216273913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 34.

The square root of 216273913 is about 14706.2542137691. The cubic root of 216273913 is about 600.2535160158.

The spelling of 216273913 in words is "two hundred sixteen million, two hundred seventy-three thousand, nine hundred thirteen".