209149441 has 2 divisors, whose sum is σ = 209149442. Its totient is φ = 209149440.

The previous prime is 209149439. The next prime is 209149471. The reversal of 209149441 is 144941902.

209149441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167159041 + 41990400 = 12929^2 + 6480^2 .

It is a cyclic number.

It is not a de Polignac number, because 209149441 - 2¹ = 209149439 is a prime.

It is a super-2 number, since 2×209149441² = 87486977341224962, which contains 22 as substring.

Together with 209149439, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 209149397 and 209149406.

It is not a weakly prime, because it can be changed into another prime (209149471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104574720 + 104574721.

It is an arithmetic number, because the mean of its divisors is an integer number (104574721).

Almost surely, 2^209149441 is an apocalyptic number.

It is an amenable number.

209149441 is a deficient number, since it is larger than the sum of its proper divisors (1).

209149441 is an equidigital number, since it uses as much as digits as its factorization.

209149441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 209149441 is about 14461.9998962799. Note that the first 3 decimals coincide. The cubic root of 209149441 is about 593.5886242728.

The spelling of 209149441 in words is "two hundred nine million, one hundred forty-nine thousand, four hundred forty-one".