205424491 has 2 divisors, whose sum is σ = 205424492. Its totient is φ = 205424490.

The previous prime is 205424437. The next prime is 205424497. The reversal of 205424491 is 194424502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205424491 - 2⁹ = 205423979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205424497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102712245 + 102712246.

It is an arithmetic number, because the mean of its divisors is an integer number (102712246).

Almost surely, 2^205424491 is an apocalyptic number.

205424491 is a deficient number, since it is larger than the sum of its proper divisors (1).

205424491 is an equidigital number, since it uses as much as digits as its factorization.

205424491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 205424491 is about 14332.6372660442. The cubic root of 205424491 is about 590.0435580213.

Adding to 205424491 its reverse (194424502), we get a palindrome (399848993).

The spelling of 205424491 in words is "two hundred five million, four hundred twenty-four thousand, four hundred ninety-one".