654335989 has 2 divisors, whose sum is σ = 654335990. Its totient is φ = 654335988.

The previous prime is 654335987. The next prime is 654336029. The reversal of 654335989 is 989533456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636552900 + 17783089 = 25230^2 + 4217^2 .

It is a cyclic number.

It is not a de Polignac number, because 654335989 - 2¹ = 654335987 is a prime.

Together with 654335987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654335987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327167994 + 327167995.

It is an arithmetic number, because the mean of its divisors is an integer number (327167995).

Almost surely, 2^654335989 is an apocalyptic number.

It is an amenable number.

654335989 is a deficient number, since it is larger than the sum of its proper divisors (1).

654335989 is an equidigital number, since it uses as much as digits as its factorization.

654335989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3499200, while the sum is 52.

The square root of 654335989 is about 25579.9919663787. The cubic root of 654335989 is about 868.1609936781.

The spelling of 654335989 in words is "six hundred fifty-four million, three hundred thirty-five thousand, nine hundred eighty-nine".