216530851 has 2 divisors, whose sum is σ = 216530852. Its totient is φ = 216530850.

The previous prime is 216530837. The next prime is 216530857. The reversal of 216530851 is 158035612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216530851 - 2⁹ = 216530339 is a prime.

It is not a weakly prime, because it can be changed into another prime (216530857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108265425 + 108265426.

It is an arithmetic number, because the mean of its divisors is an integer number (108265426).

Almost surely, 2^216530851 is an apocalyptic number.

216530851 is a deficient number, since it is larger than the sum of its proper divisors (1).

216530851 is an equidigital number, since it uses as much as digits as its factorization.

216530851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 216530851 is about 14714.9872918735. The cubic root of 216530851 is about 600.4911265851.

The spelling of 216530851 in words is "two hundred sixteen million, five hundred thirty thousand, eight hundred fifty-one".