214820909 has 2 divisors, whose sum is σ = 214820910. Its totient is φ = 214820908.

The previous prime is 214820867. The next prime is 214820911. The reversal of 214820909 is 909028412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206726884 + 8094025 = 14378^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 214820909 - 2²⁰ = 213772333 is a prime.

It is a super-2 number, since 2×214820909² = 92296045887172562, which contains 22 as substring.

Together with 214820911, 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 (214820939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107410454 + 107410455.

It is an arithmetic number, because the mean of its divisors is an integer number (107410455).

Almost surely, 2^214820909 is an apocalyptic number.

It is an amenable number.

214820909 is a deficient number, since it is larger than the sum of its proper divisors (1).

214820909 is an equidigital number, since it uses as much as digits as its factorization.

214820909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 214820909 is about 14656.7700739283. The cubic root of 214820909 is about 598.9062564941.

The spelling of 214820909 in words is "two hundred fourteen million, eight hundred twenty thousand, nine hundred nine".