654740621 has 2 divisors, whose sum is σ = 654740622. Its totient is φ = 654740620.

The previous prime is 654740617. The next prime is 654740657. The reversal of 654740621 is 126047456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 598340521 + 56400100 = 24461^2 + 7510^2 .

It is a cyclic number.

It is not a de Polignac number, because 654740621 - 2² = 654740617 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654748621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327370310 + 327370311.

It is an arithmetic number, because the mean of its divisors is an integer number (327370311).

Almost surely, 2^654740621 is an apocalyptic number.

It is an amenable number.

654740621 is a deficient number, since it is larger than the sum of its proper divisors (1).

654740621 is an equidigital number, since it uses as much as digits as its factorization.

654740621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 654740621 is about 25587.8998942860. The cubic root of 654740621 is about 868.3399095766.

The spelling of 654740621 in words is "six hundred fifty-four million, seven hundred forty thousand, six hundred twenty-one".