204030989 has 2 divisors, whose sum is σ = 204030990. Its totient is φ = 204030988.

The previous prime is 204030971. The next prime is 204031039. The reversal of 204030989 is 989030402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173317225 + 30713764 = 13165^2 + 5542^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204030989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204030089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102015494 + 102015495.

It is an arithmetic number, because the mean of its divisors is an integer number (102015495).

Almost surely, 2^204030989 is an apocalyptic number.

It is an amenable number.

204030989 is a deficient number, since it is larger than the sum of its proper divisors (1).

204030989 is an equidigital number, since it uses as much as digits as its factorization.

204030989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 204030989 is about 14283.9416478786. The cubic root of 204030989 is about 588.7063381808.

The spelling of 204030989 in words is "two hundred four million, thirty thousand, nine hundred eighty-nine".