204168989 has 2 divisors, whose sum is σ = 204168990. Its totient is φ = 204168988.

The previous prime is 204168977. The next prime is 204169001. The reversal of 204168989 is 989861402.

It is a balanced prime because it is at equal distance from previous prime (204168977) and next prime (204169001).

It can be written as a sum of positive squares in only one way, i.e., 103327225 + 100841764 = 10165^2 + 10042^2 .

It is a cyclic number.

It is not a de Polignac number, because 204168989 - 2⁴ = 204168973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204168089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102084494 + 102084495.

It is an arithmetic number, because the mean of its divisors is an integer number (102084495).

Almost surely, 2^204168989 is an apocalyptic number.

It is an amenable number.

204168989 is a deficient number, since it is larger than the sum of its proper divisors (1).

204168989 is an equidigital number, since it uses as much as digits as its factorization.

204168989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 204168989 is about 14288.7714307424. The cubic root of 204168989 is about 588.8390356133.

The spelling of 204168989 in words is "two hundred four million, one hundred sixty-eight thousand, nine hundred eighty-nine".