204045181 has 2 divisors, whose sum is σ = 204045182. Its totient is φ = 204045180.

The previous prime is 204045139. The next prime is 204045211. The reversal of 204045181 is 181540402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117722500 + 86322681 = 10850^2 + 9291^2 .

It is a cyclic number.

It is not a de Polignac number, because 204045181 - 2⁷ = 204045053 is a prime.

It is a super-2 number, since 2×204045181² = 83268871778645522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204745181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102022590 + 102022591.

It is an arithmetic number, because the mean of its divisors is an integer number (102022591).

Almost surely, 2^204045181 is an apocalyptic number.

It is an amenable number.

204045181 is a deficient number, since it is larger than the sum of its proper divisors (1).

204045181 is an equidigital number, since it uses as much as digits as its factorization.

204045181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 204045181 is about 14284.4384208831. The cubic root of 204045181 is about 588.7199876215.

Adding to 204045181 its reverse (181540402), we get a palindrome (385585583).

The spelling of 204045181 in words is "two hundred four million, forty-five thousand, one hundred eighty-one".