204140257 has 2 divisors, whose sum is σ = 204140258. Its totient is φ = 204140256.

The previous prime is 204140231. The next prime is 204140269. The reversal of 204140257 is 752041402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158860816 + 45279441 = 12604^2 + 6729^2 .

It is a cyclic number.

It is not a de Polignac number, because 204140257 - 2²³ = 195751649 is a prime.

It is not a weakly prime, because it can be changed into another prime (204140557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102070128 + 102070129.

It is an arithmetic number, because the mean of its divisors is an integer number (102070129).

Almost surely, 2^204140257 is an apocalyptic number.

It is an amenable number.

204140257 is a deficient number, since it is larger than the sum of its proper divisors (1).

204140257 is an equidigital number, since it uses as much as digits as its factorization.

204140257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 204140257 is about 14287.7659905249. The cubic root of 204140257 is about 588.8114125531.

Adding to 204140257 its reverse (752041402), we get a palindrome (956181659).

The spelling of 204140257 in words is "two hundred four million, one hundred forty thousand, two hundred fifty-seven".