654717491 has 2 divisors, whose sum is σ = 654717492. Its totient is φ = 654717490.

The previous prime is 654717487. The next prime is 654717493. The reversal of 654717491 is 194717456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 654717491 - 2² = 654717487 is a prime.

Together with 654717493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (654717493) 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, 327358745 + 327358746.

It is an arithmetic number, because the mean of its divisors is an integer number (327358746).

Almost surely, 2^654717491 is an apocalyptic number.

654717491 is a deficient number, since it is larger than the sum of its proper divisors (1).

654717491 is an equidigital number, since it uses as much as digits as its factorization.

654717491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 44.

The square root of 654717491 is about 25587.4479188527. The cubic root of 654717491 is about 868.3296841845.

The spelling of 654717491 in words is "six hundred fifty-four million, seven hundred seventeen thousand, four hundred ninety-one".