205442357 has 2 divisors, whose sum is σ = 205442358. Its totient is φ = 205442356.

The previous prime is 205442309. The next prime is 205442381. The reversal of 205442357 is 753244502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203889841 + 1552516 = 14279^2 + 1246^2 .

It is a cyclic number.

It is not a de Polignac number, because 205442357 - 2¹⁰ = 205441333 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 (205442387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102721178 + 102721179.

It is an arithmetic number, because the mean of its divisors is an integer number (102721179).

Almost surely, 2^205442357 is an apocalyptic number.

It is an amenable number.

205442357 is a deficient number, since it is larger than the sum of its proper divisors (1).

205442357 is an equidigital number, since it uses as much as digits as its factorization.

205442357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 32.

The square root of 205442357 is about 14333.2605153189. The cubic root of 205442357 is about 590.0606631104.

Adding to 205442357 its reverse (753244502), we get a palindrome (958686859).

The spelling of 205442357 in words is "two hundred five million, four hundred forty-two thousand, three hundred fifty-seven".