209129741 has 2 divisors, whose sum is σ = 209129742. Its totient is φ = 209129740.

The previous prime is 209129729. The next prime is 209129747. The reversal of 209129741 is 147921902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156625225 + 52504516 = 12515^2 + 7246^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209129741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209129747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104564870 + 104564871.

It is an arithmetic number, because the mean of its divisors is an integer number (104564871).

Almost surely, 2^209129741 is an apocalyptic number.

It is an amenable number.

209129741 is a deficient number, since it is larger than the sum of its proper divisors (1).

209129741 is an equidigital number, since it uses as much as digits as its factorization.

209129741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 209129741 is about 14461.3187849518. The cubic root of 209129741 is about 593.5699867809.

The spelling of 209129741 in words is "two hundred nine million, one hundred twenty-nine thousand, seven hundred forty-one".