209401043 has 2 divisors, whose sum is σ = 209401044. Its totient is φ = 209401042.

The previous prime is 209401009. The next prime is 209401051. The reversal of 209401043 is 340104902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209401043 - 2⁶ = 209400979 is a prime.

It is not a weakly prime, because it can be changed into another prime (209401243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104700521 + 104700522.

It is an arithmetic number, because the mean of its divisors is an integer number (104700522).

Almost surely, 2^209401043 is an apocalyptic number.

209401043 is a deficient number, since it is larger than the sum of its proper divisors (1).

209401043 is an equidigital number, since it uses as much as digits as its factorization.

209401043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 209401043 is about 14470.6960095221. The cubic root of 209401043 is about 593.8265534092.

Adding to 209401043 its reverse (340104902), we get a palindrome (549505945).

The spelling of 209401043 in words is "two hundred nine million, four hundred one thousand, forty-three".