205104157 has 2 divisors, whose sum is σ = 205104158. Its totient is φ = 205104156.

The previous prime is 205104113. The next prime is 205104169. The reversal of 205104157 is 751401502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171243396 + 33860761 = 13086^2 + 5819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205104157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205104187) 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, 102552078 + 102552079.

It is an arithmetic number, because the mean of its divisors is an integer number (102552079).

Almost surely, 2^205104157 is an apocalyptic number.

It is an amenable number.

205104157 is a deficient number, since it is larger than the sum of its proper divisors (1).

205104157 is an equidigital number, since it uses as much as digits as its factorization.

205104157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 205104157 is about 14321.4579215944. The cubic root of 205104157 is about 589.7366985620.

Adding to 205104157 its reverse (751401502), we get a palindrome (956505659).

The spelling of 205104157 in words is "two hundred five million, one hundred four thousand, one hundred fifty-seven".