209059457 has 2 divisors, whose sum is σ = 209059458. Its totient is φ = 209059456.

The previous prime is 209059393. The next prime is 209059469. The reversal of 209059457 is 754950902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208975936 + 83521 = 14456^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 209059457 - 2⁶ = 209059393 is a prime.

It is a super-2 number, since 2×209059457² = 87411713122269698, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (209059757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104529728 + 104529729.

It is an arithmetic number, because the mean of its divisors is an integer number (104529729).

Almost surely, 2^209059457 is an apocalyptic number.

It is an amenable number.

209059457 is a deficient number, since it is larger than the sum of its proper divisors (1).

209059457 is an equidigital number, since it uses as much as digits as its factorization.

209059457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 209059457 is about 14458.8885119154. Note that the first 3 decimals coincide. The cubic root of 209059457 is about 593.5034839691.

The spelling of 209059457 in words is "two hundred nine million, fifty-nine thousand, four hundred fifty-seven".