205220149 has 2 divisors, whose sum is σ = 205220150. Its totient is φ = 205220148.

The previous prime is 205220137. The next prime is 205220173. The reversal of 205220149 is 941022502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105719524 + 99500625 = 10282^2 + 9975^2 .

It is a cyclic number.

It is not a de Polignac number, because 205220149 - 2⁷ = 205220021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205220179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102610074 + 102610075.

It is an arithmetic number, because the mean of its divisors is an integer number (102610075).

Almost surely, 2^205220149 is an apocalyptic number.

It is an amenable number.

205220149 is a deficient number, since it is larger than the sum of its proper divisors (1).

205220149 is an equidigital number, since it uses as much as digits as its factorization.

205220149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 205220149 is about 14325.5069369290. The cubic root of 205220149 is about 589.8478483461.

It can be divided in two parts, 2052 and 20149, that added together give a square (22201 = 149²).

The spelling of 205220149 in words is "two hundred five million, two hundred twenty thousand, one hundred forty-nine".