205136417 has 2 divisors, whose sum is σ = 205136418. Its totient is φ = 205136416.

The previous prime is 205136413. The next prime is 205136429. The reversal of 205136417 is 714631502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197093521 + 8042896 = 14039^2 + 2836^2 .

It is a cyclic number.

It is not a de Polignac number, because 205136417 - 2² = 205136413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205136417.

It is not a weakly prime, because it can be changed into another prime (205136411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102568208 + 102568209.

It is an arithmetic number, because the mean of its divisors is an integer number (102568209).

Almost surely, 2^205136417 is an apocalyptic number.

It is an amenable number.

205136417 is a deficient number, since it is larger than the sum of its proper divisors (1).

205136417 is an equidigital number, since it uses as much as digits as its factorization.

205136417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 205136417 is about 14322.5841592919. The cubic root of 205136417 is about 589.7676160380.

Adding to 205136417 its reverse (714631502), we get a palindrome (919767919).

The spelling of 205136417 in words is "two hundred five million, one hundred thirty-six thousand, four hundred seventeen".