654719561 has 2 divisors, whose sum is σ = 654719562. Its totient is φ = 654719560.

The previous prime is 654719557. The next prime is 654719563. The reversal of 654719561 is 165917456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654336400 + 383161 = 25580^2 + 619^2 .

It is a cyclic number.

It is not a de Polignac number, because 654719561 - 2² = 654719557 is a prime.

It is a Sophie Germain prime.

Together with 654719563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (654719563) 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, 327359780 + 327359781.

It is an arithmetic number, because the mean of its divisors is an integer number (327359781).

Almost surely, 2^654719561 is an apocalyptic number.

It is an amenable number.

654719561 is a deficient number, since it is larger than the sum of its proper divisors (1).

654719561 is an equidigital number, since it uses as much as digits as its factorization.

654719561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 44.

The square root of 654719561 is about 25587.4883683413. The cubic root of 654719561 is about 868.3305993072.

The spelling of 654719561 in words is "six hundred fifty-four million, seven hundred nineteen thousand, five hundred sixty-one".