216304537 has 2 divisors, whose sum is σ = 216304538. Its totient is φ = 216304536.

The previous prime is 216304483. The next prime is 216304547. The reversal of 216304537 is 735403612.

216304537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187799616 + 28504921 = 13704^2 + 5339^2 .

It is a cyclic number.

It is not a de Polignac number, because 216304537 - 2¹⁹ = 215780249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216304499 and 216304508.

It is not a weakly prime, because it can be changed into another prime (216304547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108152268 + 108152269.

It is an arithmetic number, because the mean of its divisors is an integer number (108152269).

Almost surely, 2^216304537 is an apocalyptic number.

It is an amenable number.

216304537 is a deficient number, since it is larger than the sum of its proper divisors (1).

216304537 is an equidigital number, since it uses as much as digits as its factorization.

216304537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 216304537 is about 14707.2953665859. The cubic root of 216304537 is about 600.2818462874.

The spelling of 216304537 in words is "two hundred sixteen million, three hundred four thousand, five hundred thirty-seven".