205149071 has 2 divisors, whose sum is σ = 205149072. Its totient is φ = 205149070.

The previous prime is 205149037. The next prime is 205149101. The reversal of 205149071 is 170941502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205149071 is a prime.

It is a super-2 number, since 2×205149071² = 84172282664326082, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205149671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102574535 + 102574536.

It is an arithmetic number, because the mean of its divisors is an integer number (102574536).

Almost surely, 2^205149071 is an apocalyptic number.

205149071 is a deficient number, since it is larger than the sum of its proper divisors (1).

205149071 is an equidigital number, since it uses as much as digits as its factorization.

205149071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 205149071 is about 14323.0259023713. The cubic root of 205149071 is about 589.7797425472.

The spelling of 205149071 in words is "two hundred five million, one hundred forty-nine thousand, seventy-one".