216312533 has 2 divisors, whose sum is σ = 216312534. Its totient is φ = 216312532.

The previous prime is 216312497. The next prime is 216312541. The reversal of 216312533 is 335213612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170641969 + 45670564 = 13063^2 + 6758^2 .

It is a cyclic number.

It is not a de Polignac number, because 216312533 - 2²⁴ = 199535317 is a prime.

It is a super-2 number, since 2×216312533² = 93582223865752178, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216311533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108156266 + 108156267.

It is an arithmetic number, because the mean of its divisors is an integer number (108156267).

Almost surely, 2^216312533 is an apocalyptic number.

It is an amenable number.

216312533 is a deficient number, since it is larger than the sum of its proper divisors (1).

216312533 is an equidigital number, since it uses as much as digits as its factorization.

216312533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 26.

The square root of 216312533 is about 14707.5672019542. The cubic root of 216312533 is about 600.2892429492.

The spelling of 216312533 in words is "two hundred sixteen million, three hundred twelve thousand, five hundred thirty-three".