205570513 has 2 divisors, whose sum is σ = 205570514. Its totient is φ = 205570512.

The previous prime is 205570501. The next prime is 205570553. The reversal of 205570513 is 315075502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146095569 + 59474944 = 12087^2 + 7712^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205570513 is a prime.

It is not a weakly prime, because it can be changed into another prime (205570553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102785256 + 102785257.

It is an arithmetic number, because the mean of its divisors is an integer number (102785257).

Almost surely, 2^205570513 is an apocalyptic number.

It is an amenable number.

205570513 is a deficient number, since it is larger than the sum of its proper divisors (1).

205570513 is an equidigital number, since it uses as much as digits as its factorization.

205570513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 205570513 is about 14337.7303991950. The cubic root of 205570513 is about 590.1833318999.

The spelling of 205570513 in words is "two hundred five million, five hundred seventy thousand, five hundred thirteen".