654123647 has 2 divisors, whose sum is σ = 654123648. Its totient is φ = 654123646.

The previous prime is 654123643. The next prime is 654123677. The reversal of 654123647 is 746321456.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 654123647 - 2² = 654123643 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 654123647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654123643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327061823 + 327061824.

It is an arithmetic number, because the mean of its divisors is an integer number (327061824).

Almost surely, 2^654123647 is an apocalyptic number.

654123647 is a deficient number, since it is larger than the sum of its proper divisors (1).

654123647 is an equidigital number, since it uses as much as digits as its factorization.

654123647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 38.

The square root of 654123647 is about 25575.8410809889. The cubic root of 654123647 is about 868.0670730270.

The spelling of 654123647 in words is "six hundred fifty-four million, one hundred twenty-three thousand, six hundred forty-seven".