204457117 has 2 divisors, whose sum is σ = 204457118. Its totient is φ = 204457116.

The previous prime is 204457111. The next prime is 204457207. The reversal of 204457117 is 711754402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167417721 + 37039396 = 12939^2 + 6086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204457117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204457111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102228558 + 102228559.

It is an arithmetic number, because the mean of its divisors is an integer number (102228559).

Almost surely, 2^204457117 is an apocalyptic number.

It is an amenable number.

204457117 is a deficient number, since it is larger than the sum of its proper divisors (1).

204457117 is an equidigital number, since it uses as much as digits as its factorization.

204457117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 204457117 is about 14298.8501985300. The cubic root of 204457117 is about 589.1158998377.

The spelling of 204457117 in words is "two hundred four million, four hundred fifty-seven thousand, one hundred seventeen".