654309989 has 2 divisors, whose sum is σ = 654309990. Its totient is φ = 654309988.

The previous prime is 654309967. The next prime is 654310001. The reversal of 654309989 is 989903456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638572900 + 15737089 = 25270^2 + 3967^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654309989 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 654309989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654309949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327154994 + 327154995.

It is an arithmetic number, because the mean of its divisors is an integer number (327154995).

Almost surely, 2^654309989 is an apocalyptic number.

It is an amenable number.

654309989 is a deficient number, since it is larger than the sum of its proper divisors (1).

654309989 is an equidigital number, since it uses as much as digits as its factorization.

654309989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The square root of 654309989 is about 25579.4837516319. The cubic root of 654309989 is about 868.1494947514.

The spelling of 654309989 in words is "six hundred fifty-four million, three hundred nine thousand, nine hundred eighty-nine".