216617923 has 2 divisors, whose sum is σ = 216617924. Its totient is φ = 216617922.

The previous prime is 216617911. The next prime is 216617939. The reversal of 216617923 is 329716612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216617923 - 2²¹ = 214520771 is a prime.

It is not a weakly prime, because it can be changed into another prime (216617983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108308961 + 108308962.

It is an arithmetic number, because the mean of its divisors is an integer number (108308962).

Almost surely, 2^216617923 is an apocalyptic number.

216617923 is a deficient number, since it is larger than the sum of its proper divisors (1).

216617923 is an equidigital number, since it uses as much as digits as its factorization.

216617923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 216617923 is about 14717.9456107162. The cubic root of 216617923 is about 600.5716061969.

It can be divided in two parts, 21661 and 7923, that added together give a square (29584 = 172²).

The spelling of 216617923 in words is "two hundred sixteen million, six hundred seventeen thousand, nine hundred twenty-three".