209440141 has 2 divisors, whose sum is σ = 209440142. Its totient is φ = 209440140.

The previous prime is 209440111. The next prime is 209440157. The reversal of 209440141 is 141044902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179694025 + 29746116 = 13405^2 + 5454^2 .

It is a cyclic number.

It is not a de Polignac number, because 209440141 - 2⁵ = 209440109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209440111) 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, 104720070 + 104720071.

It is an arithmetic number, because the mean of its divisors is an integer number (104720071).

Almost surely, 2^209440141 is an apocalyptic number.

It is an amenable number.

209440141 is a deficient number, since it is larger than the sum of its proper divisors (1).

209440141 is an equidigital number, since it uses as much as digits as its factorization.

209440141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 209440141 is about 14472.0468835614. The cubic root of 209440141 is about 593.8635095857.

The spelling of 209440141 in words is "two hundred nine million, four hundred forty thousand, one hundred forty-one".