216715069 has 2 divisors, whose sum is σ = 216715070. Its totient is φ = 216715068.

The previous prime is 216715043. The next prime is 216715097. The reversal of 216715069 is 960517612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138180025 + 78535044 = 11755^2 + 8862^2 .

It is a cyclic number.

It is not a de Polignac number, because 216715069 - 2¹⁹ = 216190781 is a prime.

It is a super-2 number, since 2×216715069² = 93930842263349522, which contains 22 as substring.

It is equal to p_11951578 and since 216715069 and 11951578 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216715469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108357534 + 108357535.

It is an arithmetic number, because the mean of its divisors is an integer number (108357535).

Almost surely, 2^216715069 is an apocalyptic number.

It is an amenable number.

216715069 is a deficient number, since it is larger than the sum of its proper divisors (1).

216715069 is an equidigital number, since it uses as much as digits as its factorization.

216715069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 216715069 is about 14721.2454975793. The cubic root of 216715069 is about 600.6613716373.

The spelling of 216715069 in words is "two hundred sixteen million, seven hundred fifteen thousand, sixty-nine".