209129419 has 2 divisors, whose sum is σ = 209129420. Its totient is φ = 209129418.

The previous prime is 209129407. The next prime is 209129429. The reversal of 209129419 is 914921902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209129419 is a prime.

It is a super-2 number, since 2×209129419² = 87470227782555122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (209129429) 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, 104564709 + 104564710.

It is an arithmetic number, because the mean of its divisors is an integer number (104564710).

Almost surely, 2^209129419 is an apocalyptic number.

209129419 is a deficient number, since it is larger than the sum of its proper divisors (1).

209129419 is an equidigital number, since it uses as much as digits as its factorization.

209129419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 209129419 is about 14461.3076517997. The cubic root of 209129419 is about 593.5696821380.

The spelling of 209129419 in words is "two hundred nine million, one hundred twenty-nine thousand, four hundred nineteen".