205313551 has 2 divisors, whose sum is σ = 205313552. Its totient is φ = 205313550.

The previous prime is 205313497. The next prime is 205313561. The reversal of 205313551 is 155313502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205313551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205313561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102656775 + 102656776.

It is an arithmetic number, because the mean of its divisors is an integer number (102656776).

Almost surely, 2^205313551 is an apocalyptic number.

205313551 is a deficient number, since it is larger than the sum of its proper divisors (1).

205313551 is an equidigital number, since it uses as much as digits as its factorization.

205313551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 205313551 is about 14328.7665554297. The cubic root of 205313551 is about 589.9373207378.

The spelling of 205313551 in words is "two hundred five million, three hundred thirteen thousand, five hundred fifty-one".