999654647 has 2 divisors, whose sum is σ = 999654648. Its totient is φ = 999654646.

The previous prime is 999654637. The next prime is 999654697. The reversal of 999654647 is 746456999.

It is a weak prime.

It is an emirp because it is prime and its reverse (746456999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999654647 - 2⁴ = 999654631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999654637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499827323 + 499827324.

It is an arithmetic number, because the mean of its divisors is an integer number (499827324).

Almost surely, 2^999654647 is an apocalyptic number.

999654647 is a deficient number, since it is larger than the sum of its proper divisors (1).

999654647 is an equidigital number, since it uses as much as digits as its factorization.

999654647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14696640, while the sum is 59.

The square root of 999654647 is about 31617.3156197676. The cubic root of 999654647 is about 999.8848690787.

The spelling of 999654647 in words is "nine hundred ninety-nine million, six hundred fifty-four thousand, six hundred forty-seven".