654310621 has 2 divisors, whose sum is σ = 654310622. Its totient is φ = 654310620.

The previous prime is 654310597. The next prime is 654310691. The reversal of 654310621 is 126013456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 614494521 + 39816100 = 24789^2 + 6310^2 .

It is a cyclic number.

It is not a de Polignac number, because 654310621 - 2⁵ = 654310589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 654310621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654310691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327155310 + 327155311.

It is an arithmetic number, because the mean of its divisors is an integer number (327155311).

Almost surely, 2^654310621 is an apocalyptic number.

It is an amenable number.

654310621 is a deficient number, since it is larger than the sum of its proper divisors (1).

654310621 is an equidigital number, since it uses as much as digits as its factorization.

654310621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 654310621 is about 25579.4961052793. The cubic root of 654310621 is about 868.1497742674.

The spelling of 654310621 in words is "six hundred fifty-four million, three hundred ten thousand, six hundred twenty-one".