216145469 has 2 divisors, whose sum is σ = 216145470. Its totient is φ = 216145468.

The previous prime is 216145427. The next prime is 216145471. The reversal of 216145469 is 964541612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209149444 + 6996025 = 14462^2 + 2645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216145469 is a prime.

It is a super-2 number, since 2×216145469² = 93437727538459922, which contains 22 as substring.

Together with 216145471, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216145169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108072734 + 108072735.

It is an arithmetic number, because the mean of its divisors is an integer number (108072735).

Almost surely, 2^216145469 is an apocalyptic number.

It is an amenable number.

216145469 is a deficient number, since it is larger than the sum of its proper divisors (1).

216145469 is an equidigital number, since it uses as much as digits as its factorization.

216145469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 216145469 is about 14701.8865796196. The cubic root of 216145469 is about 600.1346632926.

The spelling of 216145469 in words is "two hundred sixteen million, one hundred forty-five thousand, four hundred sixty-nine".