209301139 has 2 divisors, whose sum is σ = 209301140. Its totient is φ = 209301138.

The previous prime is 209301137. The next prime is 209301217. The reversal of 209301139 is 931103902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209301139 - 2¹ = 209301137 is a prime.

Together with 209301137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (209301133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104650569 + 104650570.

It is an arithmetic number, because the mean of its divisors is an integer number (104650570).

Almost surely, 2^209301139 is an apocalyptic number.

209301139 is a deficient number, since it is larger than the sum of its proper divisors (1).

209301139 is an equidigital number, since it uses as much as digits as its factorization.

209301139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 209301139 is about 14467.2436559284. The cubic root of 209301139 is about 593.7321013404.

The spelling of 209301139 in words is "two hundred nine million, three hundred one thousand, one hundred thirty-nine".