205087693 has 2 divisors, whose sum is σ = 205087694. Its totient is φ = 205087692.

The previous prime is 205087667. The next prime is 205087703. The reversal of 205087693 is 396780502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191047684 + 14040009 = 13822^2 + 3747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205087693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205087193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102543846 + 102543847.

It is an arithmetic number, because the mean of its divisors is an integer number (102543847).

Almost surely, 2^205087693 is an apocalyptic number.

It is an amenable number.

205087693 is a deficient number, since it is larger than the sum of its proper divisors (1).

205087693 is an equidigital number, since it uses as much as digits as its factorization.

205087693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 205087693 is about 14320.8831082444. The cubic root of 205087693 is about 589.7209184742.

The spelling of 205087693 in words is "two hundred five million, eighty-seven thousand, six hundred ninety-three".