204149689 has 2 divisors, whose sum is σ = 204149690. Its totient is φ = 204149688.

The previous prime is 204149657. The next prime is 204149711. The reversal of 204149689 is 986941402.

204149689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173712400 + 30437289 = 13180^2 + 5517^2 .

It is a cyclic number.

It is not a de Polignac number, because 204149689 - 2⁵ = 204149657 is a prime.

It is not a weakly prime, because it can be changed into another prime (204149629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102074844 + 102074845.

It is an arithmetic number, because the mean of its divisors is an integer number (102074845).

Almost surely, 2^204149689 is an apocalyptic number.

It is an amenable number.

204149689 is a deficient number, since it is larger than the sum of its proper divisors (1).

204149689 is an equidigital number, since it uses as much as digits as its factorization.

204149689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 204149689 is about 14288.0960593076. The cubic root of 204149689 is about 588.8204808015.

It can be divided in two parts, 20414 and 9689, that added together give a palindrome (30103).

The spelling of 204149689 in words is "two hundred four million, one hundred forty-nine thousand, six hundred eighty-nine".