216503953 has 2 divisors, whose sum is σ = 216503954. Its totient is φ = 216503952.

The previous prime is 216503941. The next prime is 216503971. The reversal of 216503953 is 359305612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216442944 + 61009 = 14712^2 + 247^2 .

It is a cyclic number.

It is not a de Polignac number, because 216503953 - 2¹⁷ = 216372881 is a prime.

It is not a weakly prime, because it can be changed into another prime (216503453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108251976 + 108251977.

It is an arithmetic number, because the mean of its divisors is an integer number (108251977).

Almost surely, 2^216503953 is an apocalyptic number.

It is an amenable number.

216503953 is a deficient number, since it is larger than the sum of its proper divisors (1).

216503953 is an equidigital number, since it uses as much as digits as its factorization.

216503953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 34.

The square root of 216503953 is about 14714.0732973572. The cubic root of 216503953 is about 600.4662607225.

The spelling of 216503953 in words is "two hundred sixteen million, five hundred three thousand, nine hundred fifty-three".