214139209 has 2 divisors, whose sum is σ = 214139210. Its totient is φ = 214139208.

The previous prime is 214139201. The next prime is 214139221. The reversal of 214139209 is 902931412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203918400 + 10220809 = 14280^2 + 3197^2 .

It is a cyclic number.

It is not a de Polignac number, because 214139209 - 2³ = 214139201 is a prime.

It is a super-2 number, since 2×214139209² = 91711201662291362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (214139201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107069604 + 107069605.

It is an arithmetic number, because the mean of its divisors is an integer number (107069605).

Almost surely, 2^214139209 is an apocalyptic number.

It is an amenable number.

214139209 is a deficient number, since it is larger than the sum of its proper divisors (1).

214139209 is an equidigital number, since it uses as much as digits as its factorization.

214139209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 214139209 is about 14633.4961304536. The cubic root of 214139209 is about 598.2720739332.

The spelling of 214139209 in words is "two hundred fourteen million, one hundred thirty-nine thousand, two hundred nine".