204642457 has 2 divisors, whose sum is σ = 204642458. Its totient is φ = 204642456.

The previous prime is 204642443. The next prime is 204642467. The reversal of 204642457 is 754246402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186486336 + 18156121 = 13656^2 + 4261^2 .

It is a cyclic number.

It is not a de Polignac number, because 204642457 - 2⁷ = 204642329 is a prime.

It is not a weakly prime, because it can be changed into another prime (204642437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102321228 + 102321229.

It is an arithmetic number, because the mean of its divisors is an integer number (102321229).

Almost surely, 2^204642457 is an apocalyptic number.

It is an amenable number.

204642457 is a deficient number, since it is larger than the sum of its proper divisors (1).

204642457 is an equidigital number, since it uses as much as digits as its factorization.

204642457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 204642457 is about 14305.3296711401. The cubic root of 204642457 is about 589.2938569020.

Adding to 204642457 its reverse (754246402), we get a palindrome (958888859).

The spelling of 204642457 in words is "two hundred four million, six hundred forty-two thousand, four hundred fifty-seven".