216303623 has 2 divisors, whose sum is σ = 216303624. Its totient is φ = 216303622.

The previous prime is 216303611. The next prime is 216303649. The reversal of 216303623 is 326303612.

It is an a-pointer prime, because the next prime (216303649) can be obtained adding 216303623 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216303623 - 2²² = 212109319 is a prime.

It is a super-2 number, since 2×216303623² = 93574514645852258, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 216303592 and 216303601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216303023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108151811 + 108151812.

It is an arithmetic number, because the mean of its divisors is an integer number (108151812).

Almost surely, 2^216303623 is an apocalyptic number.

216303623 is a deficient number, since it is larger than the sum of its proper divisors (1).

216303623 is an equidigital number, since it uses as much as digits as its factorization.

216303623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 216303623 is about 14707.2642935388. The cubic root of 216303623 is about 600.2810007845.

The spelling of 216303623 in words is "two hundred sixteen million, three hundred three thousand, six hundred twenty-three".