209342141 has 2 divisors, whose sum is σ = 209342142. Its totient is φ = 209342140.

The previous prime is 209342129. The next prime is 209342143. The reversal of 209342141 is 141243902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182520100 + 26822041 = 13510^2 + 5179^2 .

It is a cyclic number.

It is not a de Polignac number, because 209342141 - 2²⁶ = 142233277 is a prime.

Together with 209342143, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209342141.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209342143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104671070 + 104671071.

It is an arithmetic number, because the mean of its divisors is an integer number (104671071).

Almost surely, 2^209342141 is an apocalyptic number.

It is an amenable number.

209342141 is a deficient number, since it is larger than the sum of its proper divisors (1).

209342141 is an equidigital number, since it uses as much as digits as its factorization.

209342141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 209342141 is about 14468.6606498321. The cubic root of 209342141 is about 593.7708694271.

The spelling of 209342141 in words is "two hundred nine million, three hundred forty-two thousand, one hundred forty-one".