205231447 has 2 divisors, whose sum is σ = 205231448. Its totient is φ = 205231446.

The previous prime is 205231427. The next prime is 205231513. The reversal of 205231447 is 744132502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205231447 is a prime.

It is equal to p_11352493 and since 205231447 and 11352493 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205231427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102615723 + 102615724.

It is an arithmetic number, because the mean of its divisors is an integer number (102615724).

Almost surely, 2^205231447 is an apocalyptic number.

205231447 is a deficient number, since it is larger than the sum of its proper divisors (1).

205231447 is an equidigital number, since it uses as much as digits as its factorization.

205231447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 205231447 is about 14325.9012630969. The cubic root of 205231447 is about 589.8586724598.

Adding to 205231447 its reverse (744132502), we get a palindrome (949363949).

The spelling of 205231447 in words is "two hundred five million, two hundred thirty-one thousand, four hundred forty-seven".