216526069 has 2 divisors, whose sum is σ = 216526070. Its totient is φ = 216526068.

The previous prime is 216526031. The next prime is 216526091. The reversal of 216526069 is 960625612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136656100 + 79869969 = 11690^2 + 8937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216526069 is a prime.

It is a super-2 number, since 2×216526069² = 93767077113185522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216526099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108263034 + 108263035.

It is an arithmetic number, because the mean of its divisors is an integer number (108263035).

Almost surely, 2^216526069 is an apocalyptic number.

It is an amenable number.

216526069 is a deficient number, since it is larger than the sum of its proper divisors (1).

216526069 is an equidigital number, since it uses as much as digits as its factorization.

216526069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 216526069 is about 14714.8248035782. The cubic root of 216526069 is about 600.4867060146.

The spelling of 216526069 in words is "two hundred sixteen million, five hundred twenty-six thousand, sixty-nine".