209379461 has 2 divisors, whose sum is σ = 209379462. Its totient is φ = 209379460.

The previous prime is 209379437. The next prime is 209379481. The reversal of 209379461 is 164973902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207072100 + 2307361 = 14390^2 + 1519^2 .

It is a cyclic number.

It is not a de Polignac number, because 209379461 - 2⁶ = 209379397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209379421) 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, 104689730 + 104689731.

It is an arithmetic number, because the mean of its divisors is an integer number (104689731).

Almost surely, 2^209379461 is an apocalyptic number.

It is an amenable number.

209379461 is a deficient number, since it is larger than the sum of its proper divisors (1).

209379461 is an equidigital number, since it uses as much as digits as its factorization.

209379461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 209379461 is about 14469.9502763486. The cubic root of 209379461 is about 593.8061517200.

The spelling of 209379461 in words is "two hundred nine million, three hundred seventy-nine thousand, four hundred sixty-one".