209429401 has 2 divisors, whose sum is σ = 209429402. Its totient is φ = 209429400.

The previous prime is 209429377. The next prime is 209429411. The reversal of 209429401 is 104924902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146385801 + 63043600 = 12099^2 + 7940^2 .

It is a cyclic number.

It is not a de Polignac number, because 209429401 - 2⁵ = 209429369 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (209429411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104714700 + 104714701.

It is an arithmetic number, because the mean of its divisors is an integer number (104714701).

Almost surely, 2^209429401 is an apocalyptic number.

It is an amenable number.

209429401 is a deficient number, since it is larger than the sum of its proper divisors (1).

209429401 is an equidigital number, since it uses as much as digits as its factorization.

209429401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 209429401 is about 14471.6758186466. The cubic root of 209429401 is about 593.8533583907.

The spelling of 209429401 in words is "two hundred nine million, four hundred twenty-nine thousand, four hundred one".