654116921 has 2 divisors, whose sum is σ = 654116922. Its totient is φ = 654116920.

The previous prime is 654116899. The next prime is 654116959. The reversal of 654116921 is 129611456.

654116921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 628755625 + 25361296 = 25075^2 + 5036^2 .

It is a cyclic number.

It is not a de Polignac number, because 654116921 - 2¹⁴ = 654100537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (654116321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327058460 + 327058461.

It is an arithmetic number, because the mean of its divisors is an integer number (327058461).

Almost surely, 2^654116921 is an apocalyptic number.

It is an amenable number.

654116921 is a deficient number, since it is larger than the sum of its proper divisors (1).

654116921 is an equidigital number, since it uses as much as digits as its factorization.

654116921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 654116921 is about 25575.7095893741. The cubic root of 654116921 is about 868.0640977286.

The spelling of 654116921 in words is "six hundred fifty-four million, one hundred sixteen thousand, nine hundred twenty-one".